MR Imaging System
Model MRP - 7000
TECHNICAL GUIDE
;
w-w Installation & Adjustment ---
HITACHI
HMSA
MEDICAL CORPORATION
Tokyo, Japan
.a
L2E-BM0434-2
CONFIDENTIALITY : This material contains proprietary information of
Hitachi Medical Corporation and it shall not be disclosed to the third party or
reproduced without the prior written permission of Hitachi Medical Corporation.
Copyright@ Hitachi Medical Corporation. 1991.Nl rights reserved.
Strict Prohibitions During Installation, Adjustment,
Maintenance and Inspection
The inside of the MRI room is a strong magnetic field. So it is
requested to strictly observe the following and provide a
cautions marking at the entrance of the MRI room.
1.
The servicing engineer carrying a magnetic substance such as
an artificial joint, surgical clips, etc. should never be
permitted to enter the MRI room.
2.
Especially, any person using a pacemaker must be strictly
prohibited to enter the MRI room.
3.
The cash dispensing ID card, mechanical wristwatch, floppy
disk, magnetic tape, etc. are affected by the magnetic
field.
It must be prohibited to carry them into the MRI
room.
4.
It should be strictly prohibited to use magnetic jigs and
tools inside the MRI room. The jigs and tools to be used in
"The following
the room must be of a nonmagnetic material.
may be used in the MRI, but more than lm off the gantry.
(1) Impedance meter
(2) Synchroscope
-.-
(1)
1
L2EBM0434
Page
Contents
Section I
",
l-1 ,..'cly
Procedures of Installation and Adjustment .
Section II Carry-in, Installation and Assembling
2.1
Carrying-in,
installation
2-l
and assembling the gantry . . . . . . . . . . . . .
2.1.1
Carrying-in and installing gantry . . . . .
2-l
2.1.2
Detaching gantry protection plate . . . . .
2-5
2.1.3
Leveling and fixing gantry
. . . . . . . . .
2-5
2.1.4
Assembling gantry . . . . . . . . . . . . . . .
2-6
2.1.5
Attaching gantry covers . . . . . . . . . . .
2-18
2.2 Installing patient table
2.2.1
2-26
. . . . . . . . . . . . .
Positioning, leveling
and fixing patient table
. . . . . . . . . .
2-26
2.2.2
Attaching table covers
.. ; . . . . . . . . .
2-28
2.2.3
Attaching sponge pad
.............
2-29
2.3 Installing central control console
.......
2-30
Notes for installation . . . . e . . . . . . .
2-30
Installation procedures . . . . . . . . . . .
.
2.4 MFU unit . . . . . . . . . . . . . . . . . . . . . . .
2-35
2.3.1
2.3.2
2-44
2.4.1
MRI unit . . . . . . . . . . . . . . . . . . . .
2-44
2.4.2
Filter box . . . . . . . . . . . . . . . . . . .
2-44
W
2
L!zE-mm434
'3
Section III
,
‘\
W i r i n g
3.1 Laying the cable between system components . .
.
.
3-l
.
.
.
3-4
table . . . . . . . . . . . . . . . . . . . .
.
.
.
3-4
3.2.2
Wiring central control console . . . . .
.
.
.
3-7
3.2.3
Wiring MRI unit . . . . . . . . . . . . . .
.
.
.
3-9
3.2.4
Wiring filter box . . . . . . . . . . . . .
.
.
3-11
3.2.5
Wiring to ECG monitor
. . . . . . . . . .
.
.
3-13
4.1 Setting magnetic circuit temperature . . . . .
.
*
4-l
.
.
.
4-4
‘5
3.2 Connecting cable to each unit
3.2.1
Section
IV
. . . . . . . .
Connecting cables to gantry and patient
Adjustment
4.2 Switching on power supply . . . . . . . . . . .
4.3 Cperation check of central control console . . .
4-5
4.4 Operation check of thermostatic control circuit
4-6
.’
4.4.1
4.4.2
Connection check of
thermostatic heater circuit . . . . . . . . .
4-6
Checking magnetic circuit temperature . . .
4-6
.......
4-8
............
4-8
4.5 Adjusting static field homogeneity
4.5.1
Preliminary
procedure
4.5.2
Adjustment of static field homogeneity . .
4-9
......
4-22
..................
4-27
4.6 Adjustment of gradient field build-up
4.7 Tuning the coils
4.7.1
Transmitter coil
...............
4-27
4.7.2
Receiver coils
................
4-32
of cable for adjustment . . . . .
4-32
.........
4-33
...............
4-34
(ii)
3 L2E-BM0434
4.7.2.1Adjustment
_-
4.7.2.2Entry
4.7.2.3Tuning
of receiver coil data
adjustment
4.8' Adjusting transmission gain and bias Offset
4.8.1
Bias
4.8.2
Gain
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
l
.
.
4-42
l
.
......................
4.8.2.1Initial
setting of gain dial
........
4-44
4.8.2.2Adjusting
gain
................
4-45
4.8.3
.....................
4-51
Offset
4.9 Adjusting light localizers
4.10Adjusting
.
.
.
.
.
.
.
.
.
.
.
4-52
.
gradient field strength (FOV) . . . . .
4-57
........
4-57
4.10.1 FOV adjustment for spin echo
4.10.2 FOV adjustment for gradient echo
4 - 6 2
.......
..............
4-68
..........
4-70
4.13 Checking intercom (inter-communication)
....
4-71
4.14 Write of hospital name into magnetic disk
...
4-72
.........
4-73
..........
4-74
4.11Signal
phase adjustment
4.12 Setting of date display order
4.15 Check of image analysis software
4-16 Check of ECG-gate measurement
Section V
Check of Image Quality
5.1 Check of FOV accuracy
...............
.
5-l
5.1.1
SE sequence
.................. .
5-l
5.1.2
GE sequence
...................
.
5-8
................ .
5-9
5.2 Check of distortion
5.3
............
S-10
Check of S/N ratio when HS/MR
.........
head receiver coil is used
S-10
Check of S/N ratio when HS/MR
body coil is used . . . . . . . . . . . . .
5-15
Signal-to-noise (S/N) ratio
5.3.1
5.3.2
wi
-
~
ui
(iii)
4 L2E-BM0434
5.3.3
Check of S/N ratio when joint coil is used
5.3.4
Check of S/N ratio
when large flexible body coil is used . . .
5.3.5
5.3.6
5.3.7
5-16
5-17
Check of S/N ratio
when small flexible body coil is used . . .
5-19
Check of S/N ratio
when large extremity coil is used . . . . .
5-21
Check of S/N ratio
when small extremity coil is used . . . . .
5-22
Section VI Reference Information
6.1 Connection betwein multiformat camera
and central control console . . . . . . . . . . . . .
6-l
6.2 Filming of test pattern by multiformat camera . .
6-2
Procedures . . . . . . . . . . .-. . . . . . . . .
6-2
6.3 Performance data . . . . . . . . . . . . . . . . . . .
6-3
6.2.1
6.3.1
FOV accuracy . . . . . . . . . . . . . . . . . . . .
6-3
6.3.2
Geometrical distortion . . . . . . . . . . . . .
6-3
6.3.3
Signal-to-noise (S/N) ratio . . . . . . . . . .
6-3
6.3.4
Background noise
6-3
. . . . . . . . . . . . . . . .
6.4 Recording sheets . . . . . . . . . . . . . . . . . .
(iv)
6-14
5 L!2E-BM0434
Section I
Procedures of Installation and Adjustment
2.1.1 Carrying in and installing the gantry
2.1.2
Detaching
the
2.1.3
Leveling
2.1.4
Assembling
and
gantry
fixing
the
protective
the
panels
gantry
gantry
Start the thermostat control of shielded room
I
4.1
Setting the magnetic circuit temperature
2.3,
2.4
Installing
the
central
c o n t r o l console,MRI
unit
and
others
,
1
S e e rr’
Note 1
Section III Wiring
1
2.1.5
Attaching
the
gantry
See
Note 2
covers
1
4.3
4.4.1
I
Operation
check
of
central
control
console
Connection check of thermostat heater
1
4.6
Adjusting
the
rise-up
waveform
of
gradient
field
I
I
$
4.12
Setting
of
date
displaying
order
4.14 Write of hospital name into magnetic disk
4.15 Check of image analysis software
1 - 1
6 L2E-BM0434
static
Bas the thermostat control circuit been energized for more than 60
hours after the magnetic
circuit temperature has
been set?
field
+
4.4.2
Temperature
check
..
of
magnetic
I
circuit
I
t
I
4.5.5
Adjusting
the
static
1
field
uniformity
I
J
I Removing the static field uniformity measuring instrument
2.2
Installing
table
and
fixing
the
patient
table,
and
attaching
I
the
cover
3.2.1 Wiring the patient table
J
I 4.7 Tuning and adjusting the coils
I
4.8
Transmission
gain,
bias
and
I
offset
adjustment
I1
I
t
I
I
I 4.9 Adjusting the light localixers
I
J
t
I
I
4.10
Adjusting
I
4.11
Signal
the
phase
gradient
I
I
magnetic
field
strength
(FOV)
I
adjustment
I
t
5.2 to 5.4
I
4.13
Check of image quality
Checking
the
intercom, and
I
attaching
the-covers
I
4.16 Check of ECG-gate measurement
A
END
1 - 2
7 LZE-BM0434
NOTE: 1
2
During the start-up heating of the magnetic circuit,
the cable set of the start-up heater should be le'ox%$
connected.
UJ
attached
until
the
Keep all the gantry
covers
completion 0; the static field uniformity adjustment,
since the uniformity will be shifted by detaching the
gantry covers.
l - 3
Section II
Carry-in, Installation and Assembling
2.1 Carrying in, installing and assembling the gantry
2.1.1 Carrying in and installing the gantry
(1)Place veneer panels (9t) on the floor of the carry-in
route and steel plates on them (more than 3.2t) to
prevent the floor surface from being damaged.
(2)Lift the gantry using the jack and set the chilled
roller under the gantry legs.
(3)For carrying in the gantry, anchor nuts (M24) are
provided as buried in the carry-in route shielded room
.
floors.
.Screw an eyebolt (M24) into this anchor nut.
Using a nylon sling, wire rope and winch as shown in
Fig. 2.1, carry in the gantry.
(4)At a curve of the carry-in route,
tool to rotate the rollers.
2-l
use the dedicated
9
L2E-BMQ434
u-4
0
2-2
10 L2E-BM0434
1. Weight of components
-7
2.
:
16000kg
(1)
Gantry
(2)
Patient table :
Space
necessary
for
350kg
installation
of
gantry and patient table
3800(W)X5000(D)X2350(H) mm
M8 anchor bolt
Center of magnet
(SUS304)
at 4 places
3. Dimensions and weight of components when
carried in
(1)
Gantry
222O(W)Xl460(D)X1803(8)
mm,
16000kg
provided
with
(2)
(without
covers,
rollers)
Patient
table
710(W)X2273(D)X630(H) mm
350kg (with casters)
112 anchor bolt (SUS304)
at 4 places
3705
Unit: mm
F i a . 2 . 2 Lavout P l a n o f G a n t r v a n d T a b l e o f MRP-7000
2080
22;o
Plywood
*
cover
I
I
t
2360
Lifting hang=-'
I
I
ul
zC
Qo
m
ID
C
Jack
boss
f
m
lln-
Fig. 2.3 Dimensions of Gantry when Carried in (in mm)
2 - 4
ei
12 L2E-BM0434
2.1.2 Detaching protection plate of gantry
Use non-magnetic tools for detaching the plate.
(Refer to Fig. 2.4)
(l)Remove 8 protective plates (made of plywood).
(Required tool : Hexagon key wrench No. 5)
(2)Remove 32 studs mounting the protection plates.
(Required tool : Wrench No. 17)
2.1.3 Leveling and fixing gantry
The leveling work is to be carried out by specialist of
the transportation company.
(1)Referring to Fig. 2.5, remove the rollers.
(2)Place the rubber plates (to be supplied with the
gantry) at four places of the gantry base and install
the gantry.
(3)Using the level gauge placed on the points shown in
Fig. 2.6 in X and Y directions, insert the liners It or
2t (to be supplied with the gantry) under the rubber
plates so that the gantry is placed horizontally.
Referring to Fig. 2.4, remove the jack bosses and fix the
gantry as shown below.
(1)Referring to Fig. 2.7, drill holes at the gantry fixing
places shown in Fig. 2.2.
If any steel bar obstructs the hole, make holes at the
places shifted referring to Fig. 2.7.
In such case, arrange the fixtures to be placed inside
the side covers openning.
(2)Fix the gantry, referring to the Fig. 2.7.
2 - 5
13 L2E-EM0434
l
2.1.4 Assembling gantry
Attach the heat insulation covers as shown in Fig. 10.
(1)Attach 8 heat insulation covers for the corners
referring to Fig. 2.10.
(2)After attaching the heat insulation covers, push in
blind caps to assure an efficient heat insulation as
shown in Fig. 2.11.
(3)Place the insulation plates for floor, referring to
Fig. 2.12.
(4)Mount the table supporter, referring to Fig. 2.13.
Attach the light markers as shown in Fig. 2.8 and 2.9.
(1)Attach the right and left side light markers referring
to Fig. 2.8.
(2)Attach the center light marker referring to Fig. 2.9.
(3)Make a connection of 40, 41 .and 42CN at the light
markers.
Attach the connector plates as shown in Fig. 2.12.
(1)Attach the connector plate for RF coil to the gantry
right rear leg.
(2)Attach the connector plate for start-up heater to the
gantry right rear leg.
(3)Attach the core mounting plate and connect the cables
to the preamplifier and connector plate for RF coil.
2 - 6
14 L2E-BM0434
1 5 UE-BM0434
2 - 8
16 LZE-BM0434
f-i
aJ
3
17 LZE-BM0434
Gantry base
/
Gantry
fixture
Ml2 nonmagnetic hex.
socket head bolt
I
I
Rubber plate,
accesory
to gantry
\
I\
B..
\
Copper foil
I
.-Ii /
’
I
A II i II I
To be cut so as
to touch the bolt
Unit : mm
Nonmagnetic anchor nut; prepared hole of 18
in diameter and counterbore of 30 in diameter
Fig.
2.7
Fixation
of
gantry
2 - 10
base
on
floor
1 8
L2E-BM0434
-
.
Light marker (left)
H4X12e nonmagnetic
hex. socket head bolt.
2 places
-
M4Xl2e nonmagnet i c
socket head b o l t ,
Light
Fig. 2.8
marker
(right)
Attaching the light markers
2 - 11
1 9 L2E-BM0434
hex. socket
N
I
I-J
N
F i g . 2.9
.
Attaching the lsght marker
_-
2 - 13
21 L2E-BM0434
s
u
4
2
-
14
22 L2E-BM0434
Floor
heat
insulation
material
5
It-
-
Magnet l e g
Bottom view of gantry
Fig. 2.12 Layout of floor heat insulation material
2 - 15
2 3 L2E-BM0434
$
se-
-w-
0
m
X
N
5-4
r
$
JJ
4
m
i-l
.
N
---
2 - 16
24 LZE-BM0434
/
25 L2E-BM0434
2.1.5 Attaching the gantry covers
+
Attach the covers'in the following procedure and as shown
in Fig. 2.15 (also see Fig. 2.16).
- ~ '.""-I 3
iii
(1)Attach the front cover 0.
Before attaching the front cover, connect the L-lCN, ClCN, R-lCN, 75CN and grounding wire to the control
panel on the cover. See Fig. 2.17.
(2)Attach the rear cover 0.
(3)Attach the ceiling cover 0.
(4)Attach the right and left lateral covers @ and @ with
their upper sides hung down.
NOTE: Keep
all the gantry covers attached till the
static field uniformity
completion
of
the
adjustment, since the uniformity will be shifted by
detaching the gantry cover.
d'j
2 - 18
26 L2E-BM0434
C o v e r , Front
@
Cover, Rear
@ C e i l i n g Cover
@ L a t e r a l Cover, Right
@ L a t e r a l Cover, Left
(Q Control panel Cover
@ Blind cover for cable
8 RF cover
Ql Blind cover for connectors
gig.
2.15 Gantry Covers
27
2 - 19
UE-BMO434
head SEMS
H4 X 161 nonmagnetic pan
head SEMS screv at 4 places
(accessory to gantry)
N
I
0
5
N
0
YAYlCP
head SEW
screv at 2 places
(accessory to gantry)
\I
ws
\
Fig.
4‘._
a -- -
Dan head SEW
screv at 4 places
(accessory to gantry)
2.16 Gantry Covers
t. .
(
pan
HuX~ZQ nonmagnetic
head SEMS screw
Y)
(accessory to gantr
Fig. 2.17 Wire connections to the front cover
29 L2E-BM0434
2 - 21
W6XlO
nonmagnetic hex. Socket head bolt at 12 places
H8X12 nonmagnetic hex. Socket head bolt
at 4 places.
:
-“i
Caster
Fig. 2.18 Attaching and Detaching Casters
2 - 22
30 LZE-BM0434
-
Ml0 nonmagnetic hex. nut at 2
places
Fig, 2.19 Fixation of gantry to table
2 - 23
3 1
L2E-BM0434
I
(
1040
Unit
: mm
*I
Deiail o f p o r t i o n A :
4
330
*I
I
I
m
RF cover
Cover
front
Detail of portion B :
Hex.
socket
screw
t , ( a c c e s s o r y t o rry
Linlers
Liner
Fig. 2.20 Positioning and Leveling of Patient Table
key
(nominal size.5)
.
nonmagnetic
-
hex.
bolt
~8 n o n m a g n e t i c h e x . n u t
M8
Table base
nonmagnetic
spring
W8 n o n m a g n e t i c s p e c i a l
plain washer
\
Insulation bush
Liner
In
,’
\
I
I
.
I /’
2Plywood
Lonleum
I
Copper foil
\
/
Plywood
I
i
I
Nonmagnetic anchor nut :
drilled hole of 12 in diameter
t
Unit : mm
Fig. 2.21 Fixation of Table to Floor
2 - 25
3 3 LzE,BM0434
2.2 Installing patient table
2.2.1
Positioning, leveling and fixing patient table
Referring to Fig. 2.18, 2.19, 2.20 and 2.21, position and
level the patient table in the following procedures.
(1)Connect
4CN and grounding
the cables lCN, 3CN,
conductor to the table and raise the table to the top
position.
(After the table is raised up to the top, disconnect
all cables.)
(2)Attach the four up/down adjust caster and remove the
two casters being attached.
(3)Turning the screws of the casters, adjust the table
height so that the table supporter and table base can
be connected.
(4)Fix the table supporter and table base.
(At this time do not fasten the screws too tight SO -)
that the table height can be adjusted.)
(5)Adjust the table height by turning the screws of the
casters so that the tabletop can be moved in smoothly
without any obstruction.
.*
(6)Fix the table supporter and table base firmly.
(7)To make the longitudinal movement direction of the
tabletop perpendicular to the gantry,
slide
the
tabletop to the backmost position behind the gantry and
adjust the direction of the table so that the distances
from the RF cover in right and left direction become
s a m e (175mm)
3
(8)Mark the table base and the four anchoring positions on
the floor.
2 - 26
34 L2E-BM0434
_-
(9) Remove the nuts fixing the table supporter and table
base, and move the table so that the anchor nut can
be set.
(10)
Drill holes
position.
of 12mm
diameter at the anchoring
(11) Drive in the anchors.
(12) Once again fix the table supporter and table base,
and the table base and floor.
(At this time do not fasten the screw too tight so
that the table height can be adjusted.)
(13) Attach the adjustment volts at the table height
adjusting position.
(Place the liners under the table. so that the floor
may not be scratched.)
(14) Detach the four up/down adjustment casters.
(15)
Adjust the table height by turning the adjustment
bolts so that the gap between the roller and the RF
cover becomes 4mm when the, roller at the head side of
the tabletop reaches just above the RF cover and the
connection part in front of the cover.
(16) Adjust the parallelism of the tabletop with the level
gauges placed on the cover under the tabletop in X
and Y directions by sliding the tabletop toward the
gantry and turning the adjustment bolts.
(17) Insert the liners into the designated places.
(18) Detach the adjustment bolts and liners being used for
protecting the floor, and once again check procedures
(7), (15) and (16).
(19) Fix the table tightly.
2 - 27
35 L2E-BM0434
0 Foot Cover, Right
8 F o o t Cover, L e f t
0 Foot Cover, Front
@ Foot Cover, Rear
0 Cable Cover
Q Sponge
.
M4XlOC nonmagnetic screws at 14 places
(accessary t o t a b l e )
Fig.
2.22
Covers of patient table
2.2.3 Attaching sponge pad
Referring to Fig. 2.22, attach the sponge pad on the edge
of the table using adhesives.
(Measure the gap between the front cover of the gantry and
table cover and select the sponge pad with the thickness
suitable for the gap.)
2 - 29
3 7 L2E-BM0434
2.3 Installing central control console
2.3.1 Notes for installation
wj
Before installing the central control COnSOlet carry out
works with care to the followings :
(l)When lifting up the central
control console, hook ropes to 4
bolts of the transport jigs and
lift it up.
Fig. 2.3.1
.
Fig. 2.3.2
Watch
c3 bump
1
I
,
E
b
Watch
adjusters
Fig. 2.3.3
(2)Remove the transport jigs to
When the
move
the console.
console is moved being attached
jigs,
a -i I
with the transport
special attention must be paid
to the people around as the jigs
are extended beyond the corners
of the console. (Refer to the
Appendix 1)
(3)The casters and adjusters are
provided at the legs of the
control console. Make sure that
the adjusters are at the highest
the
position
before moving
console.
(If not, adjust them
to the highest position.)
Take
care that the adjusters do not
hit bump when the console is
moved on the bumpy floor.
2 - 30
30 LZEBM0434
control
the
carry-in
(4)When
console into the operation room
through a narrow door, lift up
the control panel base as shown
Refer to
2.3.4.
in Fig.
Appendix 2.
Fig. 2.3.4
console
control
central
(5)The
should not be placed under the
(Water drops
air cooling unit.
from the cooling unit may cause
trouble.)
Fig. 2.3.5
(6)The front panel can be opened up
when the 5" optical disk unit is
to be installed or the PCBs and
EL display are to be checked.
Refer to Appendix 3.
Fig. 2.3.6
2 - 31
3 9
L!JE-BM0434
Appendix 1
Detaching the transport jigs
1) Remove 4 screws and detach the front transport jig.
*
Transport
-1
jig
Fig. 2.3.7
2) Remove 2 bolts and detach
the
rear transport jig.
ansport
jig
hexagon
wrench
Fig. 2.3.8
2 - 32
40 L2E.BM0434
Appendix 2
Opening and closing control panel base
_- _-
1) Remove the front cover.
2) Remove 4 volts using Ml0 hexagon wrench.
3) Lift up the control panel base.
4) Hook the stopper located at the center of the base to the
stand side.
r
-
\
Front
cover
Fig. 2.3.9
2 - 33
4 1
L2E-BM0434
Appendix 3
Opening and closing front panel
.
'-%_I
-)
1) Remove 3 set screws fixing the top rear cover.
2) Lift
up the bottom of the cover and detach it from the
front panel.
3) Disconnect the monitor cable
detaching the blind patch.
from
the
cover
after
4) Remove the top rear cover.
Top rear cover
Fig. 2.3.10
5) Raise the front cover holding both the side ends.
(The cover is stopped at approx. 45O with the arm
stopper.)
6) TO close the front panel, raise the panel 0 frontward
and push the stopper @ backward to release it.
Arm
stopper
Fig. 2.3.11
2 - 34
42 L2E-BM0434
2.3.2 Installation procedures
(1)Detach the front cover by removing 6 screws.
Front
cover
Fig. 2.3.12
(2)Detach the rear cover by removing 6 screws.
(3)Detach the top rear cover.
(Refer to Appendix 3 Opening and closing front panel)
Top rear cover
\ Rear cover
Fig. 2.3.13
.
2 -
35
43
LZEBM0434
(4)Open
the front cover.
-.
Install the optical
disk
unit at this place after
removing the top panel.
\Top p a n e l
Fig.
(5)'Detach
by removing the 6 screws.
the top,panel
(6)Installation
of
2.3.14
5"
optical
disk
unit.
Install the ODR unit and formatter.
Filter
guide
N o t e : Remove the
filter guide
prior to
installation
Formatter
IF PCB
Formatter
unit
Fig. 2 . 3 . 1 5
NOTE: Remove the formatter and IF PCB from the formatter
unit
prior
to
installation.
2 - 36
4 4 L2E-BM0434
‘. ,.-
Guide
plate
Fig. 2.3.16
Fig. 2.3.17
(6)-l Remove the guide plate.
ODR
unit
45
L2E-BM0434
/
Fig. 2.3.18
(6)-2 Install the ODR unit with 4 M4xlO screws.
2 - 37
Fig. 2.3.19
(6)-3 Referring to Fig. 2.3.17, fix the ODR unit so that
the hole diameter of the ODR cover becomes approx.
7mm.
4
Fig. 2 . 3 . 2 0
(6)-4 Mount the filter guide with 2 M4xlO
SEMS screws.
Guide plate
Fig. 2.3.21
(6)-S Attach the guide plate which has been detached in
Fig. 2.3.15.
2 -
38
46 LZE-BM0434
PCB base
Fig. 2.3.22
(6)-6 Mount the PC3 base with 4 M4xlO SEMS screw
Support
screw
IF PCB
Fig. 2.3.23
(6)-7 Mount the IF PCB with 4 support screws and connect
the signal cable (b) and power cable (c).
Fig. 2.3.24
(6)-E! Mount the formatter with 4 M3x8 SEMS screws.
2 - 39
47 L2E-BM0434
i
9
h
d
e
Fig. 2.3.25
(6)-9 Connect the following cables.
Fig. 2.3.26
(6)-10 Connect the cable (j).
2 - 40
40
L2E-BM0434
(7)Installation of magnetikdisk unit
Fig. 2.3.27
(7)-l Install the magnetic disk unit on the MD disk base
with 4 M4x8 screws.
MD power
cable (l-53)
MD signal cable (l-J11
Fig. 2.3.28
(7)-2 Connect the MD signal cable (l-Jl) and MD power
cable (l-53). Refer to Fig. 2.3.28.
2 -
41
49 L2E-BM0434
(8) Attach the front’ cover with 6 screws.
Fig.
2.3.29
(9) Attach the rear cover with 6 screws.
NOTE: Attach it after turning on the FFB.
(10)
Attach the top rear cover with 3 screws.
Top rear cover
Rear cover
Fig.
2.3.30
NOTE: Attach the front and rear covers after connecting
all the cables.
2 - 42
5 0
L2E-Bh10434
(11) Place the monitor.
Fig. 2.3.31
(12) Connect the monitor cable.
.w‘7
Shield
Clamp
Fig. 2.3.32
2 - 43
51 LZE-BM0434
2.4 MRI Unit
2.4.1MRI
unit
4
(l)The MRI unit is provided with a cooling fan at the rear
side.
So place the unit at least 15 cm away from the
wall.
(2)
Secure a space for maintenance work at the front and
left sides of the unit.
(3)After installation and wiring, fix the unit with the
casters raised by the floor adjuster.
Wall
s
Unit
15 cm
min.
/
Fig. 2.23 Installation of MRI Unit
2.4.2 Filter box
The filter box is to be installed during the work of
shielding the MRI room. If it is necessary to install the
unit during installation of the MRI system, do it in the
following procedure.
2 - 44
52 L2E-BM0434
Fig. 2.24 shows the installation of the filter box.
The
dash line indicates the outside dimensions of the filter
box.
The filter box consists of two parts which are to be
shielded
installed outside and
inside the
room,
respectively.
For ensuring the RF shielding effect, fix
the filter box to the shielding panel at intervals of 50
mm along the entire circumference.
The filter box should be fixed with M6 through-bolts and
nuts at the points indicated with small circles, and with
M4 tapping screws at the points indicated with black spots
to provide secure contact between the shielding panel and
filter
box.
1
After mounting the filter box to the shielded wall connect
the accessory grounding wire between the grounding stud of
the inside unit and ground terminal of the outside unit.
2 - 45
53 LZE-BM0434
Inside shielded room I
-------_------ - - ’ I
I.
: I
- - - - - - - - - - - - - - - - - - ’ Outside shielded r o o m
v-e-a_---------,
I
Shielding
panel
!-
686
635
*
10 x 50 pitches = 500
1
I *
IC
Fixation with
M6 bolt and
nut
\
I ;
\
;$I
Fixation to
-w>
panel with
M4 t a p p i n g
1:
Opening
for
shielding
panel
600X900
I
screw
I---ffmw----s.t--------*----- ‘-I
4-b’ 1
Cable
cover
L---,,-,-e-m---$
!
Cable
i
!
inlet/outlet
4
Fig. 2.24 Installation of Filter
2 - 46
-
Unit
:
mm
Box
54 LZE-BM0434
Section III Wiring
3.1 Laying the cables between system components
Refer to the wiring diagram and cables lists.
the cable, take the following in consideration:
When laying
-The cables generally include the RF transmission/reception
cables (RF), gradient magnetic field power cable (GC),
signal cables (SIG), power cables (POW) and grounding
For preventing image quality deterioration
cables (GND).
cables
and malfunction, separate cables by laying them in
pits as shown below and shielding (see the CABLE TYPE
columns in the cables lists).
- First connect the grounding cables.
(l)Inside the shielded room
(2)Outside the shielded room
Example wiring pits (in mm)
3 -1
55 L2E-BM0434
(007) (124)-----------.m----y
,--------------------
i
(106)
(334)
FIL
(107)
:
I
I
I
I
I
(002) (311) (336)
::yi;
(brown)
I
I
I
(307)
(308)
( 3 0 9 ) (003)
(335)
(310)
013)
(337)
(312)
(114)
(115)
(327)
(328)
(116)
(329)
(390)
r-------------------------~
(11.7) (330)
MRI
unit
(118)
(331)
-a-
MRI
green)
- - J’
(yellow)
ww
(302)
(102)
1304)
(305)
(301)
DP
(white)
(306)
clPatient
table
TB
(blue)
IMAGER
/
..
Note
Cable are
l
l
*
to be prepared at site.
The color name shown below the abbreviation of
each unit name indicates
the ID color of a tape
on each cable connected to the Unit.
3 -‘2
5 6
LZE-BM0434
102
MRI
DP
0.7
103 1 MRI f F I L 1
1.
104 MKI
!
FIL
0.6
I 0.7 I 1.0 I
0.7
14.1
ULSTSB
3Xl4AWC
I ss.3 luLsr-sa
1.0
3xIAWG
0
I
.
I
I
I
I
I
I 0 I
I
I
KA212973.A
1KAZ12973.F
26.3
ULsr-SB
XX6AWG
0
I
ma
IULST-SB
9 X6AWG
0
6.6
UL2464SS
2xIOAWG
141
llJLsS8
3xl4AWG
--e%
~212073.G
Kh212D73-H
KA212974.L
Kh21297CN
KA212974.N
Kh212974-P
114
FlL C A N -
0
‘KA213046-M
KA213046.N
2 6 . 7 ULST
1 x6AWG
0
1 6 . 7 ULsr
2xbAWG
0
-
6 . 6 hJL2464.66
2 x2OAWG
KA213646.T
I
1
24+x66
2465x68
I I I
301 I URI I DP I
302
LUU
DP
304
MRI
DP
I
327
MRI
FIL
1
FIL
I
1 0.3 1
0.7
0.3
0.7
0.3
1 0.6
1 0.3
1
I
I
I
I
0.3
1.7
FIL
CAN
1.2
3 2 8 FIL C A N
I
I
I
3 2 9 FIL CAN
330
0.6
I
311 1DP 1 FIL 1
312
I
1
3 0 5 1 MRI 1 D P 1
I
I
1.3
I
I 11.0
0.6
ZOPx36AWGI
i 0 1
1
I&6,7.0
2xZOAWG
I x96AWG
6.6
6D2W
8.6
6DZW
1.3
1.6
9 . 0
CG-MA-VVSB lOPx16AWG
IUu464-SB
3xlOAWG
UIl464.SB
1 xlOAWG
13
1.6
1.4
-
6.6
333
ECG
DP
0
1.0
6.0
334
ECG
FIL
I.3
3.0
336
FIL
CAN
0.9
1.0
336
DP
FIL
0.1
1.1
1.2
2.2
1 1 0
UL2464-SB
0
0
0
ax20AWG
KA212976.G
33.6+x71
33.6@X71
KA212976.H
33.66X71
33.69X71
KA212976-K
zoxaxn
I
I
zoxaxn
KA212973-C
I
IKA~I~WI-A
KA213061.Q
1 10~77x72
20X77X72
20~77x72
20~77x72
KA21306l.I:
I
20X62X72
1 20~62x72
I KA21306bE
I
27+X63
I
I
14+x34
270x63
KA324mB
36x20.6x62.4 KA324931.C
23+x36.6
23+x36.6
KA324933-f
( 3 6 X 2 0 . 6 X 6 2 . 4 1 14+x34 1 KA32493bC
36x20.6X52.4 36X20.6X62.4 KA32394Qf
I
1 0
I
I
6.0
aczVA
6.6 I
I PI
KMW
1 KA213061-P
lm~
16X35X30
[KAll2976J
146x30
IKA327176-h
CO-MA-VV.SB
lOPX26AWG
101
9.0
ICO-MA.VV.SB
fOPxZdAWG(
1 0 1
0.0
CO-MA-VV-SB
IOPXZIAWG
101
274x63
1
,4+X66
lol
9.0
3 - 3
1 20X49X72 1 20X49x72
101
tCZVA
1
I
1
6D.2W
0.6 1 1.0
l,.O
SP
I
jUL2464.SS
7.0
CAN
TB
1
1 12.0 b4A.VV-SB
FlL
FIL
1
1
FlL
338
I
101
6.6
I
I
1 0 1
Cc-MA.VV.SB
1.0
I 1.2 I 1.0
I
36PxZ6AWG
332
I
CG.WA-VV.SB
0 I
96PXZlAWGI
331
33.sgx71
I I I I I I
I~PX~~AWGI I
ICC-MA-VV.SB
13.0
f.0
337 I FIL IGAN I
I
1 13.0
0.9
CAN
KA21297kF
=I=
33.6+x71
1
0
1
1
36X16X40
KA2 I297U
I
169x37
16+x37
KA321367-D
~36X2O.SX62.4~
I4bX34
1 KA32493l-C
20X49X72
20X49X72
KA213061-R
I 20X49X72 I 20X49X72
1KA213001-I.
1 20X49X12
KA213061-L’
20X49X72
6 7
L2E-BM0434
Remove the
h e a t insul
tive cover
Keayide
I/
p(/
W
I
a
Cleat
lo-13CN
Fig. 3.2 Wiring at Right Lateral
Side of Gantry
-i-k/
Fig. 3 . 3 W i r i n g a t L e f t L a t e r a l
Side of Gantry
3.2 Connecting the cable to each unit
3.2.1 Connecting the cables to gantry and patient table
(l)Referring to Fig. 3.1, lay the cables to the gantry and
patient table.
(2)Wire the gantry referring to Figs. 3.2 and 3.3.
(3)Wire the patient table referring to Fig. 3.4.
Cable (one) led from inside
to lower right of gantry
Run#
.de
7
Run!
Cable pit
Runs
Fig. 3.1 Laying the Cables to the Gantry and Table
3 - 5
59 L2E-BM0434
Inn
Gantry
n
-
n
Side
= C l e a t
Shield
clamp
Fig. 3.4 Wiring the Patient Table
3 - 6
CD LX-BM0434
3.2.2 Wiring central control console
-
(1)Connect the external signal cables.
(2)Connect the power cable and GND cable and fix them with
clamps.
Detail of portion B :
Runfl
Run4
Detail of portion A :
02
002
P
rlP
Shield
Shield’
Fi g. 3.5
3 - 7
6 1
L2EBM0434
(3)Attach the front cover.
- " I 'YI?,
(4)Attach the rear cover after turning on the FFB.
(5)Place the central
position.
control
console
at
4;
the planned
(6)Fix the consoJe with the adjusters of the legs.
Slightly floating
Fig. 3.6
Turn the adjuster with driver and fix the console so
that the front casters are slightly floating.
3 -8
62
L2E-BMO434
3.2.3 Wiring the MRI unit
Referring to Fig. 3.5, wire the MRI unit in the following
procedure:
4
(1)Detach the right, left and rear covers from the MRI
unit.
(2)Remove the cable retainer at the rear lower portion of
the MRI unit.
(3)Connect each cable to the MRI unit (grounding cable
should be connected first), and ground the cable at the
unsheathed portion using the shield clamp.
(4)Fix the cable with the clamp.
(5)Retain the cable with the retainer for the cable not to
touch the cut portion of the rear cover.
(6)Re-install the covers having been detached.
A power of 100 V AC is delivered at the output
terminals (between 2TN-U6 and -V6) to the warning
lamp. The rated current is 1A.
3-9
63 L2G-EM0434
rI vYJ5-4
I
3 - 10
64 LZE-BM0434
3.2.4 Wiring filter box
Wire the filter box from inside and outside the shielded
Referring to Fig. 3.2.9, connect the cables as
room.
follows.
(l)In case the filter box must be modified for
installation to a shield wall of a nonstandard
thickness, modify the cables from inside before.
Cut the external sheath only of the cable and shift it.
(2)Detach the cover from the filter box.
(3)Detach the internal wiring duct cover, lay and connect
the cables.
(4)Remount the wiring duct cover.
(5)Ground the cable at the unsheathed portion using the
shield clamp.
(6)Fix the cable with the clamp.
(7)Remount the cover having been detached.
In case the filter box is installed as directed laterally,
the cables can also be led in and out in the direction of
arrow.
lines (run 8309 and #329)
and reception signal lines (run 8308, #312, #328 and
#335) are not provided with any shield clamp.
NOTE : The transmission signal
3 - 11
65 L2E-BM0434
EEL
33631
c
310307
W
I
E!
P
h)
113
114
I
115
Shield clamp and cleat
I
I
I
Shield clamp and cleat
I
Outside of shielded room
Fig.
Inside of shielded room
3.8
Wiring
to
Filter
Box
3.2.5 Wiring to ECG monitor
(1)Connect the power cable of the ECG monitor to the image
control
the central
monitor power outlet inside
console.
(2)Connect the signal cable.
Power
cable
Fig. 3.9
NOTE: The run #333 cable is connected in and supplied with
the central control console when the cable length is
standard.
.
3 - 13
67
L2E-BM0434
Section IV Adjustment
4.1 Setting the magnetic circuit temperature
It is necessary to set at 32.5OC the magnetic circuit
Set the
temperature having changed during the transport.
temperature in the following procedure:
(1)Connect the start-up heater controller between the
stepdown transformer and the gantry.
Step
down
transformer
hermostatic control for upper heater
Thermostatic
control
for
lower
heater
To Gantry
71 to 74cn
At the right
side rear
leg portion >
200 V AC
ground
(2)Turn on the circuit breaker in the stepdown tarnSfOrmer --)
and the circuit
breaker in. the start-up heater
controller.
The pilot lamp of the controller for Startup heater.
(3)Counterclockwise turn to 30.0°C the dial of the
thermostatic control at the start-up heater controller.
(4)In case the4 ON lamp at the upper right of the
thermostatic control is on, it is necessary to raise the
magnetic circuit temperature in the following procedure:
(a)Gradually turn the dial of the thermostatic control
until the ON lamp turns off.
(b)The divisions of temperature over which the dial has
been turned are the
difference
between
t h e
temperature at present and the set temperature.
-1
4 -1
68 LZG-EM0434
-
(c)The time required for temperature rise is referred to
Fig. 4.1.
(d)Set the thermostatic control dial to 27OC.
Check
that the ON lamp of the thermostatic control turns on
and the relay at the left is turned on at that time.
If the wiring has been completed and the gantry fans
are powered, set the dial to 30°C.
(c)If the magnetic circuit temperature has risen and the
thermostatic control has automatically been turned
off, the temperature setting is complete.
However,
if the wiring is not yet completed even at this
stage, keep the start-up heater turned on.
(f)Turn off the circuit breaker in the stepdown
transformer
the start-up
heater
and disconnect
controller.
(5)If the ON lamp at the upper right of the thermostatic
control is not lit, it is necessary to lower the magnetic
circuit temperature in the following procedure:
(a)Gradually turn the dial of the thermostatic control
until the ON lamp lights turns on.
(b)The divisiins of temperature over which the dial has
been
difference
between
the
turned are
the
temperature at present and set temperature.
(c)If the temperature difference exceeds 4OC, detach the
heat-insulative covers at the right and left lateral
sides of the gantry to cool the gantry inside. At
this time, lower the temperature in the MRI room .as
much as possible.
(d)Turn off the circuit breaker of the stepdown
transformer and disconnect the cable set for start-up
heater.
4 - 2
69 L2E-EM0434
(c)When a time required for raising the magnetic circuit
temperature has passed or when the pointer of the
heater power meter at the lower front left of the MRI
unit has started deflecting after the power supply is
turned on, re-install the heat-insulative covers.
1 I I
l.O'c/h
J
/
/
10
20
Temp. difference ("C)
Fig. 4.1 Time Required for Temperature Rise
4
Ambient
temp. 20°C
-0.25OC/h
Temp. difference ("Cl
Fig. 4.2 Time Required for Cooling
4 -3
70 L2E-BM0434
..‘,‘?\
,
ul@:
c
4.2 Switching on power supply
Before switching on the power supply to the system, check as
follows:
(1) If you felt something strange at any point during wiring,
check that point once again.
(2) Check
the insulation between each power line and the
ground potential at the terminal chassis located at the
rear lower left portion of the MRI unit.
(3)
Pushing in all the circuit boards, check the circuit
boards and connectors to see that they are securely
connected.
Check as follows with the power on:
The
(l)Turn on the MAINS
FFB (101 FFB) of the MRI unit.
4
gantry and thermostatic control circuit (heater unit in
the MRI unit) which are to be continuously energized will
be energized and the HEATER lamp on the central control
console be illuminated.
(2)Next, press the CPU ON/OFF switch on the central control
console, and the latter will be energized.
(3)Then, press the MR ON/OFF switch on the central control
console, and the MRI unit and patient table will be
energized.
With the above operations, all the component units of the
system are energized.
4 - 4
71 L2E-BM0434
4.3 Operation check of central control console
Check that circuit boards are
correctly and securely inserted,
and also check the cables and DC
sources (by checking whether
power
corresponding LEDs are lit or not)
No
Yes
Protocol
changeable?
9
No+
Yes
Image r e a d / w r i t e
from/into
OD
No !I
Initialize and
loading of all
accessory
programs
NOTE: In some cases, the software
having been registered in the HD
at the time of shipment is
different in version from the
software in the OD. So, reload
all the accessory software
referring to the section II of
Technical Guide-Check 6 Service
Programs.
by
See NOTE.
check
programs.
The CPU POWER switch must be kept turned on also in the
subsequent procedure.
I f i t i s n o t , MR POWER switch cannot be
turned on.
4 - 5
72 L2E-BM0434
4.4 Operation check of thermostatic control circuit
-
-,
4.4.1 Connection check of thermostatic heater circuit
After switching on the power supply as in item 4.2, check
the thermostatic heater as in the following:
(1)Tilt to ON/OFF CONT position the switches 2015 and 202s
on the heater unit located at the front lower left
portion of tQe MRI unit.
(2)Make sure that the voltmeter pointer of the power unit
for the heater unit deflects to 35 V dc.
(3)Check that the ammeter of the power unit for the heater
unit indicates a value with the following range:
- Righthand power source (upper) : 7.0 to 9.0 A
- Lefthand power source (lower) : 10.0 to 12.5 A
(4)Return the switches 2015 and 202s to NORMAL position.
(5)Record the measured values.
4.4.2 Checking the magnetic circuit temperature
After setting the magnetic circuit temperature as in item
4.1, check as follows after a predetermined time for
temperature stabilization has passed:
(l)Turn off the CPU POWER switch on the central control
console, and then turn off the MAINS 101 FFB at the
front portion of the MRI unit.
(2)Detach the cover from the filter box from the control
room, and disconnect the connector 7CN.
4 - 6
73 L2E-BM0434
(3)Using a digital voltmeter, measure the resistance
(resistance of the thermistor for detection of the
temperature of the upper magnet) between the connectors
7CN-1 and -13, and that (resistance of the thermistor
for detection of the temperature of the lower magnet)
between the connectors ~CN-2 and -14.
(4)Reconnect the connector 7CN, and turn on the MAINS FFB
(101 FFB) to put the heater control circuit into
operation.
(5)The values
follows:
measured
at
the step (3) should be as
Between 7CN-1 and -13 : 808 to 844n (+0.5OC)
Between 7CN-2 and -14 : 808 to 844Q (~t0.5~C)
Difference between the
value measured 7CN-1
and -13 and that between
7CN-2 and -14
: 9L? at maximum (+O.lS°C)
(6)Record the measured values.
4-7
74 LZE-BM0434
4.5 Adjusting the static field homogeneity
4.5.1 Preliminary prosedure
When
(l)Wait until the magnet temperature gets stable.
the following two conditions are met, the magnet is
stable in temperature.
(a)60 hours has passed after the thermostatic control
circuit is put into operation.
(b)Referring to the separate Technical Guide "Static
field homogeneity tester", measure the static field
The fluctuation should
homogeneity every 3 hours.
For DEG, enter
be less than 1 ppm at 21, X and Y.
" 9 0" .
(2)Referring to Fig. 4.10.10-1.2, do as follows:
Attach the accessory dial gauge fixture @ (4 pieces)
After attaching the spindle
to the adjusting cap @.
to the accessory dial gauge 8, insert the dial gauge
into the hole in the dial gauge fixture @ and turn the
Tighten
fixing bolt 0 by hand to fix the dial gauge.
the fixing bolt @ as fitted in the groove of the dial
gauge.
Do not try to tighten the fixing bolt using a
If the fixing bolt is tightened using a tool,
tool.
the spindle cannot be moved.
Do not loosen the fixing bolt @ (4 X 4 pieces) or the
upper yoke @ may possibly fall.
(3)Set the dial gauge to "0".
(4)Put the accessory dedicated
the dial gauge.
4 - 8
heat
insulation
cover
to
75 L2E-BM0434
4.5.2 Adjustment of static field homogeneity
(1)Set the probe plate of 400 x 350 mm of the magnetic W3
field tester.
(2)Adjust according to the instructions given in the
separate Technical Guide "Static field homogeneity
tester". For DEG, enter "90".
(3)Adjust concerning 21, ~2, ~3, 24, ZY, X, Y according to
the field homogeneity adjusting flow chart.
(4)Adjust each of the above items according to the
magnetic field analysis results and Table 4.1.
NOTE 1 :
When the field homogeneity has
been done
concerning,Zl, 22, 23 and 24, measure the static
field at the 3 points: center, top and bottom,
and then compare the frequency at each point on
the CRT.
If there is found a different of more
than 100 Hz between the frequencies, press the &.
space key and select "E" to end the measurement.
Retry the adjustment.
(5)If the field homogeneity is within the permissible
value (PK/PK = 60 ppm be taken a measure; only a small
number of measuring
points is available for a
measurement with 90° and the PK/PK value will be
smaller than in the measurement with 300), end the
measurement with 90°.
If the measured field
homogeneity does not meet the permissible value, repeat
the adjustment and measurement until it is within the
permissible value.
(6)When the measured value with 90° is found within the
permissible value, effect a measurement with 30° to
check the final data.
4 - 9
7 6 L2E-BM0434
(7)Once the static field homogeneity is found within the
permissible value, end the adjustment.
If not, repeat
the adjustment and measurement until it is attained.
(8)When the measured static field homogeneity is found
within the permissible value, check its reproducibility after the fixation.
The fixation should be done as follows:
Adjusting yoke 0:
Evenly tighten the adjusting bolt @ (at 3 Places) and
fixing bolt @ (at 3 places) using a hex. wrench key,
not any pipe wrench.
Adjusting cap @:
With the dial gauge set to "O", CW turn the adjusting
Uniformly
bolt @ until the gauge indicates 0.07 mm.
tighten the fixing bolts 0 until the gauge indication
returns to "0".
NOTE2 : During
the field homogeneity adjustment, be
careful as follows for no difference to occur in
temperature between the magnet top and bottom:
insulation
1)For the adjustment,
the heat
materials for the upper
adjusting yoke (at
upper center) and adjusting caps (at upper four
corners) should not be left detached for more
than 30 min.
2)Also the heat insulation materials other than
the above should not be left detached for more
than 30 min.
4 - 10
77 L2E-BM0434
(9)When the measured magnetic field measured with the
conditions of 400 x 350 mm and 30* is found within the %.>
permissible value, select the magnetic field analysis -"!
mode and analyze the magnetic field through calculation
Make
with parameters of DSV X, Y, Z = 200 and DEG. 30.
sure that the Pk-Pk value is less than 14 ppm.
4 - 11
78 L2E-BM0434
@ Upper yoke 8 Upper adjusting yoke 0 Column
@ Fixing bolt, Ml2 hex. socket (nominal size 10)
0 Adjusting bolt, 1412 hex. socket (nominal size 6)
Q Adjusting cap
8 Fixing bolt, M20 hex. socket (nominal size 17)
@I Adiustinu bolt, H36 hex. socket (nominal size 14)
@ -Dial gauge fixture (spanner 22)
6 Dill gauie
@ F i x i n g b o l t , 744 h e x . socket (nominal size 3)
@
@
@
@
Lower adjusting yoke
Adjusting device for lower adjusting yoke
Accessory handle
Fixing bolt, Ml6 hex. socket (painted yellow)
Detail of portion A
Detail of portion C
LGl
Upper adjusting yoke:
The yoke is moved 1.75 rni by
turning the bolt@one full
turn.
Lower adjusting yoke:
The yoke is moved 0.05 mm by
turning the accessory handle
@ one full turn.
Fig. 4.10.-l
Homogeneity
Adjusting
Point
(1)
@ Upper yoke adjusting bolts 8 pcs , I420 (nominal size 10, T wrench)
0 Lower yoke adjusting bolts 2 PCS, M20 (nominal size 10, T wrench)
Rear side
Fig. 4.10.10-2 Homogeneity Adjusting Points (2)
@zY
Adjustment
I
The digital values in the
-+ flov chart are not any
allowable values but ones in
the process of adjustment.
Field homogeneity
measurement
I
IYes
I
I
@23adjustment
I
Field homogeneity
measurement
I
NO
No
I
0~4
adjustment
I
Field homogeneity
measurement
I
I
t=
@@Z2
adjustment
1
Field homogeneity
measurement
@@Z2
/Field homoseneity 1
I
I
NOTEl:
u
NOTEZ:
adjustment
The Nos. 0 to @ indicate
for
Allowable values
nonhomogeneity
Zl, 22, x, Y
+lOppm max.
23
fl5ppm max.
24
k2Oppm max.
Others
~ I ?:lOppm
max. I
the step Nos. in Table 4.1.
4 - 14
81 L2E-BM0434
Table
No.
I tern
Q
21
4.1
Adjusting
point
Wwe r
adjusting
yoke 8
Adjustment
Sign
of
Adjusting
magnetic
fields
method
Variation of
other item
Loosen the fixing bolt @ in the
upper adjusting yoke 8 (see
d e t a i l o f p o r t i o n B). N e x t
adjust, referring to Pig.
4.10.11, so that the difference
i n m,agnetic f i e l d i n t e n s i t y
between two points Z+(O, 0, +lOO)
mm and z-(0, 0, -1OO)mm is less
t h a n O.OlG (43Hz).
+ Turn the adjusting bolt 8
CCW to lower the adjusting
yoke C3.
oZ2=0.24
x21
- Turn the adjusting bolt @ CW
to raise the adjusting yoke
8.
Lower
adjusting
yoke @
Adjust, referring to Fig.
4.10.11, so that the difference,
in magnetic field intensity
between two points Z+ (0, 0,
+lOO) mm and Z- (0, 0, -100) mm
*is less than O.OlG (43 Hz).
+ Turn the handle @ CW to lower
the adjusting yoke 0.
- Turn the handle @. CCW to
raise the adjusting yoke @.
c3
23
Upper yoke
adjusting
bolts @
+ Extract all eight upper yoke
adjusting bolts 16 to a same
length at a s a m e time.
- Insert all eight upper yoke
adjusting bolts 16 to a s a m e
length at a s a m e time.
nz1=-0.95xnz3
Do not turn the adjusting bolts
more than +/-31 turns from the
position adjusted at factory
before shipment.
6
24
Upper yoke Q
+ Raise the upper yoke a.
- Lower the upper yoke @.
At this time, the gap moving
amount should be as follows:
0.0028x(10.8Z4-Z2)mm
The adjusting method is referred
to No. @@.
4 - 15
az2=-2.93
xaz4
82 L2E-BM0434
No.
I tern
Adjusting
point
@
x
Upper yokea
Sign
Adjusting method
Variation of
other item
(1) Evenly loosen the fixing
bolts @ in the adjusting
cap @‘(four each).
At this
time, the dial gauge
indication deviates +O.OS
to 0.1 mm, but do not move
the scale.
(2) For smooth move of the
upper yoke, each move at
two points should be less
than 0.1 mm.
( 3 ) R e f e r r i n g t o F i g . 4.10.14,
determine a necessary gap
moving amount for correction of nonhomogeneity item
of x.
+
-
1)
I n c a s e o f 22X):
Turn the adjusting bolts
8 at LGl and LG2 CCW to
lower the left side of
the upper yoke a.
2)
In case of 22<0:
Turn the adjusting bolts
@ at LG3 and LG4 CW to
raise the right side of
the upper yoke a.
11
2)
aI
Y
Upper yokea
In case of 22>0:
Turn the adjusting bolts
8 at LG3 and LG4 CCW to
l o w e r t h e l e f t .side o f
the upper yoke Q.
I n c a s e o f 22eO:
Turn the adjusting bolts
8 at LGl and LG2 CW to
raise the left side of
the upper yoke a.
(1) Evenly loosen the fixing
bolts @ in the adjusting
cap 6) (four each). At this
time, the dial gauge
indication deviates +0.05
to 0.1 mm, but do not move
the scale.
(2) For smooth move of the
upper yoke, each move at
two points should be less
than 0.1 mm.
4 - 16
83 L2EBM0434
1
No.
I tern
Adjusting
point
Q
Y
Upper yokea
Adjusting
Sign
( 3 ) R e f e r r i n g t o F i g . 4.10.14,
determine a necessary gap
moving amount for correct i o n of nonhomogeneity item
o f Y.
+
1)
In case of 22>0:
Turn the adjusting bolts
8 at LG2 and LG4 CCW t0
lower the front side of
the upper yoke a.
2)
In case of 22<0:
Turn the adjusting bolts
(&, at LGl and LG3 CW to
raise the rear side of
the upper yoke 0.
1)
I n c a s e o f 22>0:
Turn the adjusting bolts
(&, at LGl and LG3 CCW to
lower the rear side of
the upper yoke @.
2)
In case of 22x0:
Turn the adjusting bolts
8 at LG2 and LG4 CW to
raise the front side of
the upper yoke a.
b
-
8
0
c3
0
22
Upper and
lower adjusting yokes Q
and @
Upper yoke @
Variation of
other item
method
+
Insert both the upper and
lower adjusting yokes 8 and
@.
A24= O.OSXA22
- *Extract both the upper and
lower adjusting yokes 8 and
@.
(1)
Evenly loosen the fixing
bolts 0 (detail of portion
A) in the adjusting cap 8
At
this
time,
(four each).
the dial g a u g e indication
deviates +0.05 to 0.1 mm,
but do not move the scale.
(2) For parallel move of the
upper yoke, each move at
four points LGl, LG2, LG3
and LG4 should be less than
0.1 mm.
A26= 0.05XA22
’
A24= -0.34XA22
A26= 0.07XA22
( 3 ) R e f e r r i n g t o F i g . 4.10.12,
determine a necessary gap
moving amount for correction of nonhomogeneity item
of 22.
4 - 17
54
L2E-BM0434
No.
Item
Adjusting
point
Sign
-
.”
. .
Upper
c3
yoke
0
+
0
Adjusting
method
Variation of
other item
T u r n t h e a d j u s t i n g b o l t BCCW
to lower the upper yoke aa
necessary moving amount.
- T u r n t h e a d j u s t i n g b o l t aCcW
to raise the upper yoke aa
necessary moving amount.
@
ZY
Upper yoke
adjusting
+
b o l t s @’
(front side)
and lower
yoke adjusting bolts @
(rear side)
a’
Insert 2 bolts @ at front
side of upper yoke, and
extract 2 bolts 0 at rear
side of lower yoke.
AZ21 -1.OSxAZY
- Extract 2 bolts @ at front
side of upper yoke, and
insert 2 bolts 0 at rear side
of lower yoke.
Do not turn the adjusting
bolts more than +/-31 turns
from the position adjusted at
factory befor shipment.
4 - 18
8 5 L2E-BM0434
c
c
w
c
4c
w
Adjusting
handle
CzYfxrglIf
4
an
N
0
N
* a d j u s t i n g yoke(mm)
t
0
.
f
N
adjusting
a
P
0
-
K
W
.
N
.
~
I-L
4I
z
a3
a
c
P
-
-
/
U .
c
ul
-
yoke(mm)
.
22:43.1 ppm/mm (0.023 mm/ppm)
/
&I
C
3
1
P
Id
14.7 ppm/mm
c"
-4
si
E
(0.068 mm/ppml
0
-1
-30
-20
-10
0
lo
20
30
22,
24
(ppm)
Fig. 4.10.13 Gap Moving Amounts for 22, 24
I
0
X: 24.6 ppm/O.l mm\ (0.0041 mm/ppm)
0
10
Y: 56.2 p&0.1
I
20
30
mm (0 .0018 mm/ppm)
I
*
40
X,i(ppm)
Fig. 4.10.14 Gap Moving Amount for X, Y
4 - 20
87 L2E-BM0434
See NOTE
0.175
1
ppm/rot
0.125
ppm/rot
10
e
U
20
30
-4
-2
Fig. 4.10.15
2
0
23 (ppm)
Adjusting Bolt Rotation for 23
0.325
-10
'4
-5
0
5
See NOTE
ppm/rot
10
2Y
1 ppm)
Fig. 4.10.16 Adjusting Bolt Rotation for ZY
NOTE :
The adjusting bolts U?J and CD for 23 and ZY should not
be rotated more than 31 tunrs from the position
adjusted at factory before shipment.
e'
a
4 - 21
88 L2E-BM0434
4.6 Adjustment of gradient field build-up
-
The equipment has already been adjusted at factory before
shipment so that
the gradient field is built up
appropriately, but it is recommended to check at site and
For the fine
make a fine adjustment if necessary.
adjustment, refer to the instruction manual for the gradient
field tester.
(1)Install the search coil stand so that the search coil is
at the left side on the X-axis and at feet side on the Yaxis.
(2)Mount the search coil on the search coil stand so that
its portion to which the cable is connected is upside.
(3)Set up the gradient field tester by making necessary
connections to the tester, and set the switches on the G
CONT2 board of the GC unit inside the MRI unit as
follows:
5sw
PULSE
4sw
X
3sw
ZGND
YGND
XTEST
2sw
1sw
(4)Observe the SIG OUT1 and SIG OUT2 waveforms of the
gradient field tester using an oscilloscope with storage
(so-called storage-type oscilloscope), and make offset
adjustment referring to the instruction manual.
(5)Make sure that the peak value of the output signal
If not, adjust
waveform at SIG OUT1 is 2.5 V +/- 0.5 V.
the X-axial position by turning the adjusting screws on
the search coil stand.
4 - 22
89 L2E-BMOd34
Also, set the switches on the G CONT2 board as shown in
Table 4.2. Make sure that the peak value of the SIG OUT
Output signal waveform is 2.5 V +/- 0.5 V when each of
If a deviation is
the X-axis to Z-axis is adjusted.
found, make a positional adjustment in each of the Xaxial to Z-axial directions.
After completion of the checking or adjustment, securely
tighten the screws on the search coil stand.
Table 4.2
Switches
on G CONTZ
X-axis
Y-axis
I
Z-axis
I
5sw
PULSE
PULSE
I
PULSE
I
4sw
X
3sw
ZGND
zsw
YGND
YTEST
1sw
XIPEST
XGND
trimmer
18VR-20VR
ZSVR-31VR
board
Adjusting
YGND
I
I
XGND
I
I
(6)Make sure that the output signal waveform in each of the
axes (SIG OUT1 and SIG OUT2) meets all the following
conditions.
If not, make a fine adjustment by turning
the adjusting trimmer for each of the axial directions.
4 - 23
90 L2E.BM0434
-?..,
w)'
Condition 1:
SIG OUT1 waveform
J~~~~~-7~
----------- --e-m --------4 - Av
II
4
I1
t
i
II
II
SIG OUT2 waveform
I
II
I
!
‘1. Sms’
Fig. 4.11
Observing conditions:
: 1 V/div.
: 20 mV/div.
: 500 ps/div.
- SIG OUT1 waveform
- SIG OUT2 waveform
- Time base
The output signal waveform in each of the axial
directions under the conditions shown in Fig. 4.11 should
meet the following relation:
AV/V x 100 I 0.7
Condition 2 :
--------SIG OUT2
Fig. 4.12
4 - 24
91 L2E-BM0434
Observing conditions:
: 1 V/div.
: 20 mV/div.
: SO ms/div.
- SIG OUT1 waveform
- SIG OUT2 waveform
- Time base
The output signal waveform in each of the axial
directions under the conditions shown in Fig. 4.12 should
meet the following relation:
nv/v x 100 I 0.7
Condition 3 :
SIG OUT1
waveform
4
Fig. 4.13
Observing conditions:
: 0.5 V/div.
: 100 ps/div.
- SIG OUT1 waveform
- Time base
The output signal waveform in each of the axial
directions under the conditions shown in Fig. 4.12 should
meet the following relation:
X-Y axis
340 +/- 80 ps
TTO : 490 +/- 80 /IS
9'50
:
2 axis
T50
:
T70
:
4 - 25
220 zk 80 ps
300 5 80 ps
92 L!2E-BM0434
NOTE:
-
indicate lengths of time from the
waveform starts rising until SO%, 70% of the peak
value V are reached, respectively.
WI
and
T70
(7)After completion of the checking and adjustment, set the
switches on the G CONTZ board as follows:
5sw
4sw
3sw
:
:
:
2sw
:
1sw
:
DC
X
ZDEMAND
YDEMAND
XDEMAND
Power cord
I
Gradient
field tester
Coaxial
Oscil .loscope
with storage
I
/-
cables
4
/
Search coil stand
NOTE:
Only thicker spacer should be inserted between
the search coil and stand.
Fig. 4.14
4 - 26
93 L2E-BMW34
4.7 Tuning the coils
The coils have been already adjusted at factory at the time ?,
of shipment. We believe that the adjustments have not been ep$
so much deteriorated during the transport, but it is
recommended to effect fine adjustment and check of them.
Record the values before and after the adjustments.
- Adjusting conditions:
The adjustment should be done in a condition in which a
measurement can be done after other adjustments except for
the coil and transmission gain adjustments have already been
completed.
4.7.1 Transmitter coil
(1)Using the frequency search (FREQUENCY SEARCH : 48-7)
program among the service
measure the
programs,
resonant frequency.
If the tuned state of the coil is
greatly different from that having been done at factory
before shipment (it varies depending upon the cable
length, etc.), an error will be caused and the d
frequency search is impossible.
In such case, tune the
transmitter and receiver coils with reference to a
resonant frequency obtained through the adjustment of
field uniformity, thereby
enabling
the frequency
search.
The frequency search is referred to item 5.6
in the Technical Guide - Check & Service Programs.
(2)Detach the two lids located on the rear cover of the
gantry as shown in Fig. 4.15 to adjust the tuning board
and to connect the impedance meter.
..
4 - 27
94 LZE-BM0434
a : Tuning adjustment part
0 : Impedance meter connection part
Fig. 4.15
(3)Short-circuit the cross diode using.the shorting bar on
the tuning board.
(4)Disconnect, at the 9CN side, the BNC of the cable
connected from the tuning board to the output connector
9CN, and connect the probe of the impedance meter as
shown below.
9CN (BNC)
--) To impedance
Tuning board
meter
\
Type T-BNC conversion COnneCtOr,
accessory to the system
(5)Set the frequency of the impedance meter to the
resonant frequency, and adjust the variable capacitors
1VC (Cr) and 2VC (Cm) on the tuning board for the
impedance to be within a range of 50 210 ohms and phase
to be within a range of 0 ~00~.
4 - 28
95 L2E-BM0434
(6)Disconnect the impedance meter probe and connect the
'^. _
cable from the tuning board to the 9CN (return to the 4.;
normal state).
Also make the shorting bar on the tuning board in
release status.
(7)Using the SIGNAL GENERATION CHECK of the PSC check
program, perform measurement sequence operation to
search the f*requency which makes the reflection power
minimum and readjustment by shifting the frequency at
the time of tuning adjustment by the difference from
the resonance frequency'.
Repeat this adjustment procedures ((3) - (7)) until the
reflection power is reduced less than 15%.
Procedures :
(a)Manually set the resonant frequency using a dial on
SYNTH 2 module.
(b)Select the standard protocols setting of BRAIN and ,&
SCANOGRAM, but set only TR to 1OOms (the protocol
BRAIN must be selected).
Start the SIGNAL GENERATION check (3) program among
the PSC check program (47-5) under the following
conditions :
FRQ
= 00000(resonant
Tune = 18 (tuned value)
GAIN = 14 (gain)
frequency) .
(c)Check the reflection power by the meter and meter
range select switch on the front panel of the power
amplifier.
4 - 29
96 L2E-BM0434
Pilot
lamp
\
Reflection
/detection lamp
i
Meter indication
select switch
connector
monitor
Front panel of power amplifier
-With the meter indication select switch @ to FWD
(output power) and adjust the. transmission gain
control (GAIN) of the TRANS4 module for the
pointer of the meter 0 to deflect to 80%.
- Set the switch @to RFD (reflection power) and
read the deflection of the pointer of the meter
0. The reading is the reflection power.
(d)If the reflection power is less than 15%, the
If more than 15%,
adjustment can be terminated.
make readjustment as per the following procedures.
(Be sure to check the reflection power by setting
the resonant frequency.)
(c)Changing the frequency by the frequency dial of the
SYNTH2 (with the switch set to Local side), search
the frequency which makes the reflection power
Obtain the difference between this
minimum.
frequency fl and the resonant frequency(fo),
and
adjust the frequency fo' to be set at readjustment
to the value shifted reversely by the value of the
difference.
4 - 30
97 L2E-BM0434
fo’ = fo
.8 + (fo - fl)
e k.\
Carry out the readjustment with this fo' as per di
(3).
(8)Change over the switch of the SYNTHZ module to REMOTE
(usual state) and remount the lids on the rear cover of
the gantry.
.I
4 - 31
98 L2E-BM0434
.
.
4.7.2 Receiver coils
-
Each of receiver coils should be tuned and checked as in
The items variable with each
the following procedures.
The optional coils should
coil are listed in Table 4.3.
be checked and adjusted as instructed in the documents
accessory to‘the coils.
4.7.2.1 Adjustment of cable for adjustment
Adjust the A/2 cable for adjustment.
(This cable is not provided with the system.)
h/Z,cable
(for adjustment)
c
Impedance
meter
probe
Trimmer
(1)Connect
meter.
the
h/2
condenser
cable
to
the
probe
of
the
impedance
Leave the other end of the cable open.
(2)Set the frequency of the impedance meter to the
resonance frequency of the system.
(3)Adjust the trimmer condenser to make the impedance
maximum (approx.l,4kQ-1.7kQ).
4 - 32
99
L2E-BM0434
4.7.2.2 Entry of receiver coil data
Select and run the service program COIL DATA ENTRY (4831), set a coil name and RF reception line and enter the
For
attenuation amount for adjustment of the coil gain.
the program, refer to item 5.17 in the Technical Guide
This entry is to be done for
Check c Service Programs.
all the coils used.
Setting :
- COIL NAME :
Set a name for each coil with 16 characters
and enter it.
at maximum,
-'RF Line :
Set "3" (RF LINE B) for the existing coil, and "2" (RF
LINE A AND B) for the HS/MR coil (QD coil).
- RF ATT :
Enter an attenuation amount for the HS/MR coil (QD coil).
This setting is not necessary for other coils. This value
is selected and set at the time of'adjustment.
- TUNE STEP :
Set "3"
Set the voltage variation step at auto-tuning.
for all the settings for the time being. (If other values
are set, pre-scan may be prolonged or S/N may be lowered.)
Ex amp le of settinq :
.
4 - 33
100 L2E-BM0434
4.7.2.3 Tuning adjustment
Carry out the tuning adjustment and checking of each coil
as per the following procedures. (The flexible body coil
is not needed for the turning adjustment except for the
check.)
(1)Detach the lid and cover of the tuning box of each
Detaching steps are shown in the following.
coil.
0 HS/MR HEAD COIL Cover
/'
'
Cover \
J
@ HS/MR BODY COIL
4 - 34
Cover
1 0 1 LZE-BM0434
(2)Set the phantom for adjustment in receiver coil in the
center of the magnetic field.
Phantom No.3
/
2Omm
thick mat
for abdominal
immobilization
HS/MR HEAD COIL
Fix the phantom with aDaomlna1
immobilization belt
15mm t h i c k m a t
HS/MR BODY COIL
phantom
70mm thick
pillow mat
-
No.2
2Omm thick abdominal
immobilization
mat
15mm
Ii3
n$ thickness
I _
r
F
I
1
JOINT/LARGE EXTREMITY/SMALL EXTREMITY COIL
4 - 35
102 L2E-BM0434
SMALL
phantom
No.3
BODY
(NO.l)
phantom
No.4
FLEXIBLE
50mm
mat
COIL
50mm thick mat
15mm thick mat
(double)
SMALL
(No.2~No.4)/LARGE
(No.1)
FLEXIBLE
BODY
COIL
2Omm thick
tion
phantom
No.4
50mm thick
50mm t
mat
mat
15mm thic
mat
(double)
LARGE
FLEXIBLE
BODY
(No.2,
No.3)
coil
70mm thick
phantom
No.4
50mm thick mat
50mm
mat
15mm thick
mat
(double)
LARGE
FLEXIBLE
BODY
4 - 36
(No.4)
coil
IO3
LZE-BM0434
(3)Py r u n n i n g the PSC check program among the check
program, set a tuning voltage as in the following :
“-1
d‘!
(a)Selection of PSC check program (47-5)
(b)Selection of
SIGNAL GENERATION
check program (5)
(c)With the following set, start the program :
FREQ = 000 ( resonant frequency)
TUNE = 00 (enter a tuned value to be set as
specified in Table 4.3)
GAIN = 14
(gain)
Other than the tuned value has no direct relation with
Stop (by pressing the SPACE key) the
this adjustment.
A tuning
run of the program in several seconds.
voltage is thus completely set.
(4)Connect the receiver coil to be adjusted to the
receiving
Connect
the h/2 cable for
connector.
I
adjustment t"o the BNC connector for adjustment, and -‘
connect the impedance meter to this connector.
Connector for adjustment (LINE B)
Solenoid side of QD coil and single coil
/for adjustment
A/2 cable
Connector for ad'ustment (LINE
A) Saddle side o z QD coil for
adjustment
.
4 - 37
Impedance
-probe
meter
104 LZE-BM0434
(5)Set the frequency of the impedance m e t e r t o the
resonant frequency, and adjust the trimmer condenser
for tuning so that the impedance and phase become equal
to those shown in Table 4.3.
Adjust the solenoid and saddle side coils of the HS/MR
HEAD and BODY COILS respectively.
Check only the maximum impedance and phase for FLEXIBLE
SPINE COIL (trimmer condenser is not provided).
Table 4.3 Receiver coil adjustment values
Tune
Coil #
Coil name
Phantom # value to
be set
1
HS/MR Head
2
HS/MR Body
3
Impedance
adjust.(n)
Phase
adjust.
Tuned value
range to be
checked
3
16
200+100
ItlO"
OC-4E
4
18
200+100
fl0”
OC-4E
Joint/Neck
2
18
60-150
*lo”
OC-36
4
Large
Extremity
2
18
60-150
*lo”
OC-36
5
Small
Extremity
2
18
60-150
fl0"
OC-36
6
Large
Flexible
4
--
zoo* 100
f15”
OC-72
3
Be
550_+100
f15"
OC-72
4
--
200-+100
&15"
OC-72
4
Body No.l-4
7
Small Flexible
Body No.1
Small
Flexible
Body No.2 to 4
8-31 As specified in the document attached to the coils
Location of trimmer condensers of each coil
adjustment are as follows :
Other trimmer condensers should not be adjusted.
4 - 38
for
105 LZE-BM0434
1
I
Solenoid
Saddle &ide
side
HS/MR Head coil
JOINT/LARGE and SMALL EXTREMITY coil
4 - 39
106 LZE-BM0434
Saddle
ajde
Solenoid
side
HS/MR Body coil
4 - 40
107 LZE-BM0434
(6)For determination of attenuation value (ATT value) of
::,
HS/MR coil (QD coil), measure SN ratio of solenoid and
saddle side of HS/MR coil respectively, and obtain the ~1
ATT value from the SN ratio.
Follow the same procedures for HS/MR head and body
.I
coils.
Procedures :
0 Set the phantom (in the same way as in tuning
adjustment).
0 Change RF LINE,by COIL DATA ENTRY program.
Solenoid side : RF LINE = 3
Saddle side
: RF LINE = 1
0 Scan an image for SN ratio measurement and measure
SN ratio.
Refer to Item 5.3 for scan procedures.
Scan is to be performed in single slice.
Be sure to scan only after the RF GAIN adjustment is
done for each scan. (Refer to Item 4.8)
CD Calculate ATT value as follows :
ATT value = ZO*log(Solenoid
0
s i d e SN r a t i o / S a d d l e s i d e SN r a t i o )
Round off the ATT value obtained in @and set this
At this time
value by COIL DATA ENTRY program.
reset the RF LINE to "2".
4 - 41
108
L!lEBMOd34
w
.
4.8 Adjusting the transmission gain and bias and offset
The amplitude and offset and bias of a signal (Sine
function) supplied to the transmitter coil for generating of
RF magnetic field so that the MR signal can be efficiently
received.
- Adjusting conditions:
This adjustment should be done after other adjustments and
checking have been completed.
- Description of TRANS 4 module
Offset
I W-P
adjust
dial
Gain adjust dial
Bias
adjust
dial
4.8.1Bias
(l)Short-circuit the end of loop cable (installation jig)
of the probe (1 : 1) of an oscilloscope as shown below,
from it into a loop shape and set it in the center of
the transmitter coil so that the loop is nearly
perpendicularly.
At the time of the second and subsequent check and
adjustment,
the waveform may be observed on an
oscilloscope with the accessory coaxial cable (50 ohms)
connected to the output monitor connector of the RF
power amplifier and with the input of the oscilloscope
(Use the accessory SO-ohm
terminated with 50 ohms.
terminator and T type BNC connector.)
4 - 42
109 LZE.BM0434
0
To
oscilloscope,
(2)By running the SIGNAL GENERATION check program among
the PSC check programs, effect a serial-scan operation.
Protocol conditions : Sequence
Flip angle (FA)
TR
NSA
: GE
: 300
: 100
:2
The other protocol
particularly.
not
conditions
are
specified
(3)Observing the transmission waveform on the oscilloscope, adjust the Bias dial to make the pulse amplitude
not change at every transmission.
Lock the dial after adjustment.
Adjust the Bias dial
to make the amplitude
not change at every
transmission.
Magnified
\
4.8.2 Gain
The transmission gain of each receiver coil is automatically adjusted using the service program.
However,
initially set the gain dial by manual coarse adjustment.
4 - 43
110 LZE-BM0434
,
4.8.2.1Initial
setting of gain dial
This adjustment is to be done only during installation of
The initial gain setting should be done
the equipment.
for the craniocervical receiver coil alone.
(1)Initialize the RF gain value in the manual mode of
Set RF GAIN
the RF GAIN ADJUSTMENT program (48-8).
Details are referred to
for the coil No. 1 "32767".
the Technical Guide - Check & Service Programs.
(2)Using the accessory coaxial cable, connect an
oscilloscope to the coaxial connector AF OUT O" or
90° on the front panel of the ADC in the RF
Observe the received signal
transmitter/receiver.
just before it is converted from analogue to digital.
(3)Set the adjusting phantom at the center of the
magnetic field inside the receiver coil.
-
(4)Set the LOCAL/REMOTE switch on the SYNTHZ board in
the RF transmitter/receiver to LOCAL position, and
set a resonant frequency by the FREQUENCY dial.
Set measuring protocols as shown below (all in SE mode):
Coil No. Region Section TR
1
BRAIN
TRS
(5)Set the coil No.
operation.
TE Thickness
500 38
1
by
10
Multislice
Echo
NSA
1
1
2
the PATIENT DATA setting
(6)Set the switches on the GC CONT board in the GC unit
within the MRI unit to prevent X- and Z-directional
gradient fields from being produced.
3sw
1sw
: 2 aGND
: X GND
4 - 44
111
UE-BM0434
(7) Observe the received signal on the oscilloscope to
check that the resonant signal is developed, and ::-.,;
then raise the frequency 1 kHz by the FREQUENCY dial ‘3'i
on the SYNTH2'board.
(8) Observing the received signal on the oscilloscope,
adjust the GAIN dial on the TRANS4 board in the RF
for the amplitude of this
transmitter/receiver
signal to be maximized. At this time, the range of
the oscilloscope should be minimized as much as
possible.
(9) Set the GAIN dial for a value of the value adjusted
at the step (8) above plus 10%.
(10) Readjust .and check the bias (as in item 4.8.1)
(since the offset changes if the gain is largely
changed).
4.8.2.2Adjusting
the gain
Adjust the transmission gain for each receiver coil. a
First set the phantom and receiver coil at the imaging
center as in a real imaging.
Type in "48" and press
(l)Press the SELECT MODE key.
the ENTER key, and type in "8" and press the ENTER
key.
(2)The following message is displayed:
** RF GAIN ADJUSTMENT **
1 . . . MANUAL
2 . . . AUTO
SELECT=
4 - 45
1 1 2 L2E-BM0434
(3)After typing in "2" and pressing the ENTER key, the
following message and RF gains list are displayed and
the dial-indicated values currently set in the system
Type in a value
table are displayed as defaulted.
indicated by the dial on the TRANS4 board and press
the ENTER key.
** RF GAIN ADJUSTMENT **
DIAL NUMBER=(to be typed in at this step)
COIL NUMBER=(to be typed in at step (4))
COIL #
1
RF GAIN
xxxxxx
COIL #
17
RF GAIN
xxxxxx
16
xxxxxx
31
xxxxxx
RF pulse gains list
(4)After input of the dial-indicated value, type in a
coil No. to be adjusted according to the following
message displayed, and press the ENTER key.
When the CANCEL key is pressed, the operation goes
back to the input of the. dial-indicated value (step
(3)).
COIL NUMBER=
(5)After the coil No. is typed in, the automatic gain
adjustment is started with display of the following
message (blinks during a data measurement) :
4
RF GAIN SEARCH IN PROGRESS
When the automatic adjustment has been successfully
complete, the following message is displayed:
4 - 46
113 LZE.BM0434
RF GAIN SEARCH COMPLETED
_ '".b‘i
&
The results of the adjustment and the data measured ~1
while changing the gain are graphically displayed, and
the RF pulse gains list display is changed.
** RF GAIN ADJUSTMENT **
DIAL NUMBER=X.XX
COIL NUMBER=XX
RF GAIN SEARCH COMPLETED
=XxXx (result of adjustment)
RF GAIN
0 Graphic display of measured data (to the right of the
RF pulse gains list):
- ---------------- 4,.
Measured
data (max.)
I
+I +++
-k+ I
+
+
+
I
+
+
+
‘+
+
+
Measured
data
+
(min.)
Dial setting
(max.)
Dial setting
(min. I
The gain with which the measured data is the maximum
is taken as the result of adjustment.
Measuring points : 30 points
After an error message is displayed, the operation goes
back to .the step of input of dial-indicated value in
The
case the error message is SEARCH RANGE OVER.
process is terminated in case of any other error
message.
4 - 47
114 L2E-BM0434
When the space key is pressed in the course of the
automatic adjustment, the process is suspended with
displayed of the following message:
CONTINUE (Y/N)=
By typing in "Y" and pressing the ENTER key, the
By typing in "N" and
process is continuously done.
pressing the ENTER key, the operation goes back to
the step (2).
(6)When the automatic adjustment has. been successfully
complete, the system waits for an input by the
operator with display of the following message:
SET OK? (Y/N)=
By typing in "Y" and pressing the ENTER key, the
results of the adjustment are entered into the system
By typing in
table and the process is terminated.
"N" and pressing the ENTER key, the operation goes
back to the step (2).
4 - 48
115
L2E-BM0434
.
(7)Error messages list
*;
No.
Error message
Meaning
Operation
1
MRI UNIT ERROR
An error has occurred
This
after
program
error
ends.
in the HRI unit.
2
RF GAIN SEARCH ERROR
Time-over
-do-
Measured data are not
-do-
(PSC TIME OVER)
3
RF GAIN SEARCH ERROR
within the predetermined range even after
5 tries (data overflow
or
4
underflow).
SEARCH RANGE OVER SET
Search
DIAL NUMBER
(peak cannot be searthe step (input of
ched w i t h i n t h e s e a r c h d i a l - i n d i c a t e d value).
n
x.xx
range-over
Operation goes back to
range (RF pulse gain
of 3 2 3 6 7 to 21167)).
-Dial-indicated value (maximum)
of the graph displayed.
displayed at the end
E i t h e r “>*’ o r gl<l@
.
4
- 49
116 L2EBM0434
4
s(CAUTION >c
1) If the error item 4 (SEARCH RANGE OVER) has occurred,
do as follows:
/
Taking the
Measured data are graphically displayed.
graph as reference, change the setting of the dial on
the TRANS4 board and the entered dial-indicated value
in a direction specified by “>” or “<” in the
message. Change them by about 0.5.
When the dial setting is changed, the gain settings
for other coils having already been adjusted are
automatically adjusted so that the total gain is kept
constant according to the following equation:
(dial setting before change) x (gain setting before change) =
(dial setting after change) x (gain setting after change)
coils
need no readjustment.
Therefore,
these
However, in case the gain after changed exceeds
Since
32767, the correction will result in 32767.
this result is incorrect, it is necessary to readjust
the other coils.
2) If a time of more than 30 minutes has passed from the
If the
last scan, do a scanogram measurement once.
I
central frequency shows a large deviation, no signal
measurement can be done as the case may be.
4 - 50
1 1 7 L2E-BM0434
.
4.8.3
Offset
(1)As similarly to the case of the Bias adjustment (4.8.1- J\
short-circuit the tip of the oscilloscope probe
(211,
to make it in loop and set it vertically in the center
of the transmission coil.
(Do not use the output monitoring connector of the RF
power Amp.)
(2)Perform the continuous measurements by using the signal
generation check of the PSC check.
Protocol conditions
t
: Sequence
Flip angle(FA)
TR
NSA
: GE
: 30
: 100
:2
the
waveform on
(3)Observing
the
transmission
oscilloscope, adjust the offset dial to make the
waveform ratio equal to the undermentioned value.
Lock the dial after adjustment.
0
A t
4 - 51
A
22 2 2
-=
B
100
1 1 8 LZEBM0434
I
k&l@,;
4.9 Adjusting the light localizers
--
(1) As shown in Fig. 4.12, install the FOV phantom mount to
the head rest.
(2) Place the FOV phantom as shown in Fig. 4.13.
(3) Adjust the 1ef.k light localizer for the light beam to
coincide with the lines Y = 0 and 2 = 0 (as shown in
Fig. 4.15).
(4) Move the tabletop in the automatic mode by pressing the
SET button and take a sagittal scanogram of the FOV
phantom under the conditions of HF/S (patient setting),
. FOV = 260, slice position = 0 mm and slice thickness =
10
mm).
(5)
Display an image, and measure in the image the
deviation between the center of the image and that of
the FOV phantom. In the example B in Fig. 4.15, Y = -2
mm and Z = -2 mm. Change these parameters Y and Z to Y
= YO and Z = ZO, respectively.
.(6) Return the tabletop 771mm.
(7) Set the right and left light localizers to Y = YO and Z
= zo.
(8) Move the tabletop as indexed again and check that the
image center is Y = YO and Z = ZO.
(9) Place the FOV phantom as shown in Fig. 4.14.
(10) Move the tabletop as indexed and take a coronal
scanogram of the phantom under the same conditions as
in (4) above.
(11) Set the phantom so that the image of the FOV phantom is
straight circumferentially.
4 - 52
119 L!2E-BM0434
(12) Adjust the median-line light localizer for the light
beam to coincide with the line of X = 0.
Adjust the position and alignment referring to Fig.
4.17.
.
‘%
e‘i
(13) Move the tabletop as indexed and take a coronal
scanogram under the same conditions as in (4) above.
(14) Display an image and measure in the image the deviation
between the image center and that of the FOV phantom.
In the example B in Fig. 4.16, X = 2.
(15) Return the tabletop 771 mm.
(16) Set the median-line light localizer to X = X0;
(17) Move the tabletop as indexed and make sure that the
image center is X = X0.
4 - 53
1 2 0
1.2E-BM0434
.
Fig.
4.13
Fig. 4.14
Fig.
4.15
4 - 54
1 2 1 LZE-BM0434
.
k
.,
4 - 55
122 L2E-BM0434
socket head bolt
M4 hex. socket head bolt
M4 hex. socket head bolt
4
I
sn
I
/X=0
Fig. 4.17 Adjustment of
Medeian-line Light
Localizer
v
Circumferential
direction
I
x=+2
4.10 Adjusting the gradient field strength (FOV)
4.10.1 FOV adjustment for spin echo
(1)Set the FOV phantom in the center of the craniocervical receiver coil (coronal plane) using the
phantom mount, and move it to the center of the
magnetic field.
(2)Take scanograms of
planes.
the
transverse
and
sagittal
(3)Make sure that the gradient of the phantom is within
2 deg. with respect to the coronal plane. Also check
that the phantom center is not deviated more than 10
.
mm from the‘center of the magnetic field.
(4)Next, set scan -parameters, and make a scan of a
coronal plane as positioned in the scanogram image.
The angle for positioning should be zero.
SEQUENCE
2D/3D
SEQ. No
REPHASE
PHASE DIR
REJECTION
RECTANG
ANTI WRAP
PRE SAT
FOV
TR
TE
THICKNESS
MULTI SLICE'
ECHO
NSA
PROJECTION
: SE
:2D
:3
: OFF
: R-L
: OFF
: OFF
: OFF
: OFF
: 260
: 200
: 38
: 10
:l
: 1
: 1
: 256
4 - 57
124 L2GBM0434
.
(5) Magnify 2 .times
thus obtained.
the central portion of the image
Make sure that the gradient of the line connecting
the pins is less than f2 deg. and measure the Xdirectional distance X.
The measurement should be
done using the check program No. 31 FOV C/K.
Y
X
Coronal
image
P
(6) Adjust 9VR on the G CONT2 board in the MRI unit for
the above-mentioned distance to be 100.0 +/- 0.5 mm.
after
Record the values
the
(X p encoded)
adjustment.
(7) Change the PHASE DIR. from R-L to H-F.
(8) Take a scan of the coronal plane again, and magnify
two times the central portion of the image.
(9) Measure the Y-directional distance Cy between the
The measurement should be done using the
pins.
check program FOV C/K.
r)
(10) Adjust 8VR on the G CONTZ board for the distance ey
to be 100.0 +/- 0.5 mm.
Record the values (Y P
encoded) after the adjustment.
(11) Measure the X-directional distance Px between the
pins.
4 - 58
125 L2E-BM0434
(12) Rewrite the X-directional parameters of F-ENCD into
the value derived from the following equation under T+.,
the servicwlj
the GC ADJUSTMENT program among
programs:
r----7
‘X
L-J
100
r----7
L-A
\ Value
z
Default
measured
at step
(11)
value
(13) Change the PHASE DIR from H-F to R-L.
(14) Make a scan of a coronal plane again, and magnify
two times the central portion of the image.
(15) Measure
pins.
the Y-directional distance P, between the
i
(16) Rewrite the Y-directional parameters of F-ENCD into
the value derived from the following equation under-)
the service
the GC ADJUSTMENT program among
programs:
r----i
LA‘X
100
r----7
:-,:
-4
2
\ Value
Default
measured at step (15)
value
(17) Set the FOV phantom in the sagittal plane.
(18) Take scanograms of the transverse and coronal
planes, and make sure that the gradient of the
phantom with respect to the sagittal plane is less
than +_2 deg.
Also check that the phantom center is
not deviated more than f10 mm from the center of the
magnetic field.
4 - 59
126 L2E-BM0434
(19) Set the following scan parameters, and take an image
plane as positioned in the
in the sagittal
The angle for positioning should, be
scanogram.
zero.
: SE
SEQUENCE
: 2D
2D/3D
:3
SEQ. No
: OFF
REPHASE
: A-P
PHASE DIR
: OFF
REJECTION
: OFF
RECTANG
: OFF
ANTI WRAP
: OFF
PRE SAT
: 260
FOV
: 200
TR
: 38
TE
: 10
THICKNESS
:l
MULTI SLICE
:l
ECHO
:l
NSA
: 256
PROJECTION
.
(20) Magnify 2 times the central portion of the image
thus obtained.
Make sure that the gradient of the line connecting
the pins is less than +2 deg. and measure the Zdirectional distance 4,.
e,
Y
- -.- _.-.-.-.-.-
P
I
:
iI
i
i
i
i
i
+_2#
M max
.-.-.-.-.- f
L
i
I
i
4 - 60
127
L2E-BM0434
(21) Adjust 7VR on the G CONTZ board in the MRI unit for
the above-mentioned distance to be 100.0 +/- 0.5 mm.
‘-.'i,
4 ‘;
Record the values (z P encoded) after the adjustment.
(22) Change the PHASE DIR. from A-P to H-F.
(23) Take a scan of the coronal plane again, and magnify
two times the central portion of the image.
(24) Measure the Z-directional distance Pz between the
pins.
(25) Rewrite the Z-directional parameters of F-ENCD into
the value derived from the following equation under
the GC ADJUSTMENT program among
the service
programs:
r----1
:-,,
‘X
4
\
100
r----i
:-,,:
\Value measured at step (24)
.t Default value
4 - 61
1 2 8 LZEBM0434
4.10.2 FOV adjustment for gradient echo
This adjustment must be carried out after adjustment of
gradient magnetic field strength (FOV adjustment of SE)
by use of a spin echo (SE) image.
(1)Align the FOV phantom at the center of the receiving
coil for HS/MR head (on coronal plane) by using the
phantom mounting table and introduce it to the center
of magnetic field.
(2)Take each scanogram image on the transverse and
sagittal planes.
(3)Make sure that the gradient of phantom is within +2O
Also confirm that the center
of the coronal plane.
of phantom is not deviated beyond 210 mm from the
center of magnetic field.
(4)Arrange the conditions for next imaging and determine
the position on a scanogram image. Take the image on
For positioning, angle must be
the coronal plane.
set at 0.
SEQUENCE
2D/3D
SEQ. No
REPHASE
PHASE DIR
REJECTION
RECTANG
ANTI WRAP
PRE SAT
FOV
TR
TE
FA
THICKNESS
MULTI SLICE
N S A
PROJECTION
: GE
: 2D
:2
: OFF
: R-L
: OFF
: OFF
: OFF
: OFF
: 260
: 200
: 23
: 90
: 10
: 1
:l
: 256
4 - 62
129 L2E-BM0434
..
(5)Enlarge the. central
enlargement ratio of 2x.
area
of
the
image
at
an
"?.
&1
Make certain that the line, which connects pins, has
a slope of f2O max., and measure the distance {x
between pins in the X direction and that Py between
pins in the Y direction.
Measurement must be performed via FOV C/K.
2
i
I
-.-.-.-.-.-.I--
i.
2 2O
max.
1Px
.-.-.-.-.-.-_ 1 !
i
i
3
I
I
4
I
i
X
Coronal
image
e
(6)Rewrite the X-direction parameter of P-ENCD in
gradient echo to a value given by the formula below
under the service program "GC ADJUSTMENT."
r----i
L-J ‘X
10‘0
r----i
:--:
\ Measured value ex in (5)
\
Default value
..
4 - 63
_
130 LZE-BM0434
(7)
Rewrite the Y-direction parameter of F-ENCD in
gradient echo to a value given by the formula below
under the service program "GC ADJUSTMENT."
r----l
100
:,-J ‘X
r----7
:--:
\
z
Measured value ey in (51
value
Default
(8) Make a scan again. Measure CX and 4y, and make sure
that the measured values satisfy 100 + 0.5 mm. In
case the measured values are outside the range,
effect steps (6), (7) and (8) again.
After accuracy
values.
confirmation,
record PX
and
Cy
(9) Change the PHASE DIR from R-L to H-F.
(10) From the image on the coronal plane again and
enlarge its central area at an enlargement
magnification
of
2x.
(11) Measure the distance PX between pins in the X
direction and Py between pins in the Y direction.
(12)
Rewrite the X-direction parameter of F-ENCD in
gradient echo to a value given by the formula below
under the service program "GC ADJUSTMENT."
r - - - - 1
L-J
‘X
100
r - - - - i
I
:--J
\
z
Default
4
Measured value Qx in (11)
value
- 6 4
131 NE-EM0434
(13)
Rewrite the Y-direction parameter of P-ENCD in -gradient echo to a value given by the formula below +I'.]\,
under the service program "GC ADJUSTMENT."
r--w-,
I
L-,--J
4
'X
100
r----i
L.-A
Measured value ey in (11)
Default value
\
z
(14) Present the image again, and measure Cx and PY to
make sure that the measured values satisfy 100 20.5
mm.
In case the measured values are -outside the
range, effect'steps (12), (13) and (14) again.
After accuracy
values.
confirmation,
record
lx
and
Py
(15) Set the FOV phantom on the sagittal plane.
I
(16) Take each scanogram image on the transverse and
coronal planes.
Confirm that the slope of phantom
is within +2O of the sagittal plane. Also ascertain
that the center of phantom is not deviated beyond
210 mm from the center of magnetic field.
4 - 65
132 LZE-BM0434
-"y;
Make
(17) Arrange the conditions for next imaging.
positioni?g on a scanogram image and take the image
For positioning, angle must
on the sagittal plane.
be 0.
SEQUENCE
2D/3D
SEQ. No
REPHASE
PHASE DIR
REJECTION
RECTANG
ANTI WRAP
PRE SAT
FOV
TR
TE
FA
THICKNESS
MULTI SLICE
NSA
PROJECTION
GE
: 2D
:2
: OFF
: A-P
: OFF
: OFF
: OFF
: OFF
: 260
: 200
: 23
: 90
: 10
:l
:l
: 256
:
(18) Enlarge the central area of the image at an
Make certain that the
enlargement ratio of 2x.
line, which connects pins, has a slope of +2O max.,
and measure the distance Pz between pins in the 2
direction.
-max.
4 - 66
_.
133 L2G-BM0434
(19) Rewrite the Z-direction parameter of P-ENCD in
gradient echo to a value given by the formula below --,,%i
w'j
under the service program "GC ADJUSTMENT."
r----7
L-A
100
‘X
r----1
:-A
\ Measured
2
value in (18)
Default value
(20) Make a scan again.
Measure t?~, and make sure that
the measured values satisfy 100 +0.5 mm.
In case
the measured value is outside the range, effect
steps (19) and (20) again.
After accuracy confirmation, record Qz value.
(21) Change PHASE DIR. from A-P to H-F.
(22) Make a scan on the sagittal plane again and enlarge
the central area at an enlargement magnification of
2x.
(23)
Measure the
direction.
(24)
Rewrite
distance
the
I
d-i
pz between pins in the Z-
Z-direction
parameter
of
F-ENCD in
gradient echo to a value given by the formula below
under the service program "GC ADJUSTMENT."
r----1
L--J
‘X
3
100
r---- 1
I
I
L-,--J
\
z
Heasur ,ed
value i n (231
Default value
(25) Make a scan again. Measure Qz and make sure that it
is within a range of 100 f0.5 mm.
If outside the
range, effect steps (24) and (25) again.
After accuracy confirmation, record the 4'~ value.
4
4 - 67
134 L2E-BM043P
4
.
4.11 Signal phase adjustment
For imaging by the gradient echo method, it is necessary
to adjust for minimizing the difference in phase between
the O" and 90° signals in the RF receiver circuit since
Note that
the phase difference causes wavy artifacts.
this adjustment is not necessary during installation
When
because it has been done at factory before shipped.
the circuit board replacement or the similar maintenance
has been done in the RF transmitter/receiver, this
adjustment is required.
-Adjustment
(l)Set the Ni solution phantom middle (No.3) to the HS/MR
Head coil as shown below.
Phantom No.3
4
\
Set the phantom at the pos ition s h i f ted
slightly downward from them a g n e t i c
f i e l d centrer.
I
field
‘Phantom center
(2)Set the imaging factors or conditions as follows:
Sequence
Scan plane
FOV
TR
TE
FA
THICKNESS
MULTISLICE
ECHO
NSA
PROJECTION
: GE
: TRS
: 260
: 300 ms
: 35 ms
: 9o”
10 mm
:l
:l
:2
: 128
:
A
4 - 68
135 LZE-BM0434
(3)Adjusting the phase adjustment trimmer condenser on
the AF AMP module in the MRI unit, perform scans so
that the differential area between the real image and
imaginal image becomes smallest.
.
,Imaginal i m a g e
(shaded area)
For phase
adjustment
0
I
Adjust one
of them.
(Phase 1
or phase 2)
-Real
AF AMP module
front panel
image
Image example
Adjust the angle of the cross position of the screw
head of the trimmer condenser and scan an image, then
compare the real and imaginal images. First turn the
condenser by about 45O (l/8 turn) right and leftward
and fix the turning direction to find approximate
optimum position.
Next, adjust the condenser by a
fine angle (l/16 turn) each to reach the smallest
area of the imaginal image.
4
4 - 69
136 L2E-BM0434
-\;
4:
4.12 Setting of date displaying order
It is possible to change the displaying order of the date
digits (year, month and day) displayed with LEDs, and on
When it is
the monitor, on the central control console.
desired to change the date displaying order, set the DIP
switches on the PCON-C board (CC4165) inside the control
console according to any of the displaying orders shown in
Fig. 4.18.
All the dates displayed with the LEDs, and on
the monitor, on the control console are changed in order
Also
by changing only the settings of these DIP switches.
the date input order in adjustment of the clock (SET CLOCK
operation), birth date, etc. follows the date displaying
order after changed.
DIP switches at address 10F on the PCON-C board (CC4165)
in the central control console:
:
aYear,
month,
day
1
aMonth, d a y , year
ODay,
month, year
2
1
2
ON
3
4
5
6
7
8
3
4
5
6
7
8
4
5
6
7
8
Fig. 4.18 Setting of Date Displaying Order
a
4 - 70
137 L2E-BM0434
4.13 Checking the intercom (inter-communication)
(l)Talking from control room to MRI room
3
The sound picked up by the microphone in the control
room is conveyed to the MRI room by pressing the
Adjust the sound volume by
PATIENT INTERCOM button.
adjusting the control OC + GANTRY located at the right
bottom of the keyboard. As the PATIENT INTERCOM button
room is
is pressed,
the sound from the MRI
automatically decreased.
(2)Talk from MRI room to control room
Make sure that the sound volume can be changed by
adjusting the potentiometer on the control panel or the
control GANTRY + OC located at the right bottom of the
keyboard.
If any of these controls is set at MIN
Also the sound
position, no sound will be heard.
volume obtainable by adjusting the potentiometer
1
depends upon the position at which the control on the
Set the control at a -It
right bottom of the keyboard.
position for an appropriate sound volume which can be
obtained by adjusting the potentiometer.
.
4
Rotary potentiometer
(on the operation panel)
Pot. position for
best hearing
Pot. position for
best hearing
Rotary pot. at bottom of
Keyboard panel
(3)Auto voice control
Adjust volume of Auto voice by the volume of OC +
GANTRY
(AV) located at the right-bottom of the
keyboard.
4 - 71
138
L2E-BMOd34
e
4.14 Write of hospital name into magnetic disk
The hospital
procedure:
name
can
be
entered
in
the
following
(l)Press the SELECT MODE key to select the process menu.
Type in "48" and press the ENTER key to select the
service mode.
(2)Select and type in "2" from the service program menu
and press the ENTER key to select HOSPITAL NAME ENTRY.
(3)"HOSPITAL NAME=" is displayed. Then type in a hospital
name with a maximum of 20 characters.
- For correction of any incorrect input, press the'
ERASE key to erase characters one by one or press the
CANCEL key to erase characters in each line.
-After entry of the hospital name, make a scan of a
image on the
phantom.
Display a reconstructed
monitor and check that the hospital name entered is
displayed in the lower right portion of the monitor.
If you se: it there, the hospital name has been
surely entered.
4 - 72
139 L2E-BM0434
4.15 Check of image analysis software
According to the instructions given in the Instruction
Manual, effect the following operations for image analysis
to check that they are successfully completed:
.A?
4.)
-Level detection
-Background elimination
-Positive-negative reversal
-Nonlinear windowing
- T2 calculation
- Tl calculation
-Window selection
-Multi-framed display
- Image magnification
- Image rotation
-Right-left reversal
-Measurement of distance and angle between 2 points
-Profiling
- ROI setting
I(
-Scale display
- Edge enhancement/smoothing
-Comment display
-Histogram
-Pixel value display
- Subtraction/addition
-Nonlinear window display and entry
- Simultaneous display and selection of positioning images
.
-Auto window setting
-Synthesize image
-Gray scale display and selection
-Text page display
- MPR
- ECG display
-Uniformity check
- FOV check
- S/N check
4 - 73
140 lL!E-BP40434
4.16 Check of ECG-gated measurement
-
Make a measurement according to the instructions given in
the instruction manual for the ECG-gated measurement to
check that the ECG waveform is stably displayed and the
However, it should
measurement is done as stably gated.
be noted that some noises appear in the ECG waveform
during a measurement.
4 - 74
141 L2E-BM0434
Section V Check of Image Quality
5.1 Check of FOV accuracy
5.1.1 SE sequence
(l)Press the PATIENT DATA key to enter the patient name,
and set the patient orientation H, patient's posture S
and coil No.
(2)Set the FOV phantom in the center of the HS/MH head
receiver coil (in the transverse plane) using the
phantom mount, and move it to the center of the
magnetic field.
(3)Take scanograms in a sagittal and coronal planes.
(4)Make sure that the gradient of the phantom with respect
Also
to the transverse plane is less than +/-2 deg.
check that the distance between the center of the
4.j
phantom and that of the image is less than +/-lo mm.
These checkings are to be done by pressing the DIST key
to select the image analysis program for measurement of
the distance and angle between two points.
f2" max.
(5)Take a scanogram in the transverse plane.
(6)Check that the rotation of the phantom is within +/-2
deg.
f2O max.
r;
-
1
142 LZEBM0434
(7)Set the following scan parameters and position a scan
For this
plane at the center of the phantom.
positioning, set the angle 0 and the positional
tolerance 0 +/- 10 mm.
:
:
2D/3D
a:
SEQ. No.
:
REPHASE
:
PHASE DIR.
:
REJECTION
:
RECTANG.
:
ANTI-WRAP
:
PRESAT.
:
FOV
:
TR
:
TE
:
THICKNESS
:
MULTI SLICE
:
ECHO
:
NSA
:
PROJECTION
:
SLICE PLANE
SEQUENCE
TRS
SE
2D
3
OFF
A-P
OFF
OFF
OFF
OFF
260
200
38
10
1
1
2
256
(8)Make a scan and magnify the central portion of the
phantom image with a magnification factor of 2 under
the image analysis program for image magnification
selected by pressing the MAG button.
(9)Measure the distance & and Qx (in mm) between the
centers of the pins in the magnified phantom image.
X
(frequency
5 - 2
encoding)
143 L2E-BM0434
The measurement is to be done using the analysis
y.
program No. 42 "FOV C/K.
".:I
(a)Press the ANALYSIS key, type in “42” and press the
ENTER key to select the FOV C/K program.
l
(b)A square frame enclosing the phantom pin pattern is
If the pin pattern is out of the frame,
displayed.
operate the trackball to change the frame size so
that the pin pattern fully enters the frame.
(c)By pressing the ENTER key, the distance between the
centers of the right and left, top and bottom pin
patterns and the angle of intersection between the
lines drawn between the right and left pins, and
between the top and bottom pins are displayed as
follows:
X(F-ENCD)=OOO.O
mm)
+ Inter-pin distance in X direction (in
Y (SLICE)=***.*
Z(P-ENCD)=OOO.O + Inter-pin distance in Z direction (in
mm)
<
=OOO.O + Angle of intersection 8 between lines
drawn between right and left pins, and
between top and bottom pins (in degrees)
NOTE : F-ENCD :
Frequency encoding direction
P-ENCD : Phase encoding direction
SLICE : Slice direction
(to always
displayed with ***.*)
5 - 3
be
1 4 4 JLSBM0434
(10) Using the following equation, determine FOV accuracy
for each of the Z and X directions:
FOV accuracy (%) = (measured distance in mm - lOO)/lOO
x 100
(11) The FOV accuracy should be within the standard value
in item 6.5.
(12) Write the measured FOV accuracies into the recording
sheet.
(13) Set the phantom in a sagittal plane and move it to
the center of the magnetic field.
(14) Take scanograms in a coronal and transverse planes.
(15) Check that the gradient of the phantom with respect
Also
to the sagittal plane is less than +/-2 deg.
check that the distance between the center of the
phantom and that of the image is less than +/-lo mm.
(16) Take a scanogram in the sagittal plane.
(17) Make sure that the phantom rotation is less than +/-2
deg.
(18) Set the following scan parameters and position a
For this
slice plane at the center of the phantom.
positioning, set the angle 0 and the positional
tolerance 0 +/- 10 mm.
5 -4
145 L2E-BM0434
.
4
: SAG
: SE
: 2D
: 3
: OFF
: A-P
: OFF
: OFF
: OFF
: OFF
: 260
: 200
: 38
: 10
:l
:l
: 2
: 256
SLICE PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI -WRAP
PRESAT.
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
(19) Make a scan and magnify the central portion of the*'
phantom image with a magnification factor of 2.
(20) Measure the distance 4y and 4z (in mm) between the
centers of the pins in the magnified phantom image.
1
(21)
*
Z (phase encoding)
Determine FOV accuracy
directions.
for each of the Y and 2
(22) The FOV accuracy should be within the standard value
in item 6.5.
5 - 5
1 4 6 L2E-BM0434
(23) Write the measured FOV accuracies into the recording
sheet.
(24) Set the phantom in a coronal plane and move it to the
center of the magnetic field.
(25) Take scanograms in a transverse and sagittal planes.
(26) Check that the gradient of the phantom with respect
to the sagittal plane is less than +/-2 deg. and also
that the distance between the center of the phantom
and that of the image is less than +/-lo mm.
(27) Take a scanogram in the coronal plane.
(28) Make sure that the phantom rotation is less than t/-2
deg.
(29) Set the following scan parameters and position a
For this
slice plane at the center of the phantom.
positioning, set the angle 0 and the positional
tolerance 0 t/- 10 mm.
SLICE PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI-WRAP
PRESAT.
FOV
TR
TE
THICKNESS
MULTI SLICE.,
ECHO
NSA
PROJECTION
: COR
: SE
: 2D
:3
: OFF
: R-L
: OFF
: OFF
: OFF
: OFF
:
260
:
200
:
38
: 10
:l
:l
:2
:
256
5 - 6
1 4 7 L!2E-BM0434
(30) Make a scan and magnify the central portion of the I:.,,,
phantom image with a magnification factor of 2.
w-f
(31) Measure the distance 4x and Qy (in mm) between the
centers of the pins in the magnified phantom image.
-.-.dI
i
cx
l
I
;
C Y
-t
-.-.d-
X (phase encoding)
(32) Determine FOV accuracy
directions.
for each of the X and Y
(33) The FOV accuracy should be within the standard value
in item 6.5.
(34) Write the measured FOV accuracies into the recording -YI
sheet.
l
-
5.1.2
GE sequence
(l)With the phantom set in the same manner as for the
sequence SE, make scans in the transverse, sagittal and
coronal planes with the following scan parameters:
SEQUENCE
: GE
: 2D
2D/3D
SEQ. No.
: 2
REPRASE
: OFF
: OFF
REJECTION
: OFF
RECTANG.
: OFF
ANTI-WRAP
: OFF
PRESAT.
: 260
FOV
: 300
TR
: 23
TE
FA
: 90
THICKNESS
: 10
MULTI SLICE
:l
ECRO
:l
NSA
: 2
PROJECTION
: 256
PHASE DIR. for scan in transverse plane : A-P
: A-P
PHASE DIR. for scan in sagittal plane
: R-L
PHASE DIR. for scan in coronal plane
(2)Similarly to the sequence SE, determine FOV accuracy
for each of the planes.
(3)The FOV accuraiy.should
item 6.5.
be within
the standard value in
(4)Write the measured FOV accuracies into the
sheet.
5 - 8
recording
1 4 9 UEBM0434
5.2 Check of distortion
(l)Magnify two times the central portion of the phantolGY
image,
in the transverse plane through the FOV phantom,
which has been taken at step (8) of item 5.1 "Check of
FOV accuracy" (FOV adjustment for spin echo).
(i!)Using the analysis program No. 42 "FOV C/K (FOV check
program, measure the intersecting angle between the lines
drawn between the centers of the right and left pin
patterns and top and bottom pin patterns in the phantom
image.
(3)The intersecting angle 8 should be within the standarc'
4
value in item 6.5.
(4)Write the intersecting angle 8 into the recording sheet.
(S)Similarly, measure the intersecting angles 8 in the first
echo images, of the sagittal and coronal planes, which
have been taken at steps (19) and (30) in item 5.1 "Check
of FOV accuraby8;, and write them into the recording
sheet.
5 - 9
150 L2EBM0434
5.3 Signal-to-noise (S/N) ratio
5.3.1 Check of S/N ratio when HS/MR head receiver coil is used
(l)When the S/N ratio is checked using a phantom, it
depends upon the temperature of the phantom.
If the
temperature of a room where the phantom is stored
changes, it takes several hours until the changed room
temperature
coincides with the phantom temperature.
Therefore, for check of the S/N ratio, an adjusting
phantom (Ni-solution phantoms) should be left for
several hours in the MRI room of which the temperature
is set in a range of 20°C to 25OC before the check is
to be done.
the temperature of the MRI room should
preferably be 25OC.
Keep the set room temperature as
constant as possible. The temperature variation should
desirably be less than +/-1OC.
(2)Press the PATIENT DATA key to enter the patient name,
and set the patient orientation H, his posture S and
coil No.
(3)Place the adjusting phantom
middle) on the head rest.
(Ni-solution
phantom,
Ni solution phantom No.3 (165 dia.)
'Abdomen immobilizing
(20 mm thick)
matt
Example phantom setting
5 - 10
151 IZE-BM0434
(4)Slide the receiver coil to a position where it abuts
Have the light mark defined by the ';*
the head rest.
',
light localizer coincide with the slice mark on the -"y!
receiver coil (the light mark cannot be made coincident
Press the SET
with the cross (+) mark on the phantom.
button to set the phantom in the center of the magnetic
field.
(5)Take scanograms of a sagittal and transverse planes.
(6)Make sure that the center of the phantom is less than
10 mm from the center of the image in the scanogram of
the sagittal plane.
Also check that in the scanogram
of the transverse plane, the center of the phantom
image is less than +/-lo mm from the center of the
image.
Sagittal
image
(7)Set the following scan parameters, and make three scans
without any positioning:
SLICE PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI - WRAP
PRESAT.
C.POSITION
: TRS
: SE
: 2D
:3
: OFF
: A-P
: OFF
: OFF
: OFF
: OFF
: 0
l
5 - 11
152 L2E-BM043j
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
: 260
: 500
: 40
: 5
: 1
: 1
:2
: 256
(8) Press the DISPLAY button to display the scanned
image.
(9) Using the analysis program No. 43 "SNR C/K (S/N ratio
check program), measure the signal-to-noise ratio.
(a) Press the ANALYSIS key, type in "43" and press
the ENTER key to select the SNR C/K program.
(b) ROIs (A to E) are set as shown below:
An S/N ratio calculated by the following equation is
displayed in the form of SNR = 00.0.
S/N = (Mean value of E) / (Mean SD of A, B, C and D)
(10) Determine the S/N ratios of the three scanned images
and take the arithmetic mean of these three S/N
ratios as the S/N ratio.
5 - 12
153 L?E-BM0434
(11) Measure the phantom temperature, and determine a
reference range of the S/N ratio from the standard -Y=:;
performance data as in item 6.5. The reference rang&j
varies depending upon the temperature since the S/N
ratio of the phantom image depends upon the phantom
temperature.
(12) The measured S/N ratio should be within the reference
range determined from the above graph.
(13) Write the results of S/N ratio measurement, phantom
range of S/N ratio
temperature
and reference
(visually determined from the graph) into the
For measuring the phantom
recording sheet.
temperature, read the thermometer attached on the
The green figure on the thermometer
phantom.
indicates the phantom temperature.
(14) Set the following scan parameters, make two scans and
determine the S/N ratios in the multi-slice and
multiecho modes.
4,;
SLICE PLANE
: TRS
SEQUENCE
: SE
: 2D
2D/3D
SEQ. No.
:3
REPHASE
: OFF,
PHASE DIR.
: A-P
REJECTION
: OFF
RECTANG.
: OFF
ANTI-WRAP
: OFF
PRESAT.
: OFF
C.POSITION
: 0
: 260
FOV
TR
: 1500
TE
: 40
THICKNESS
:5
INTERVAL
: 10
MULTI SLICE
:8
: 2
ECHO
:2
NSA
PROJECTION
: 256
5 - 13
154 KE-BM0434
(15) Determine the scanned images, and a mean S/N ratio of
the first echo images and also a mean S/N ratio of
Take these mean S/N ratios
the second echo images.
for the respective echoes.
(16) The measured S/N ratio should be within the reference
range determined from the above graph.
(17) Write the results of S/N ratio measurement, phantom
ratio
temperature and reference range of S/N
(visually
determined from the graph)
into the
recording sheet.
5 - 14
1 5 5 L2E-EM0434
5.3.2 Check of S/N ratio when HS/M.R body coil is used
";,'
Similary to the check of the head coil, determine the S/N+,)
ratio.
(1)Place the adjusting phantom (No.4, 212 dia.) and cover
the phantom with the rece.iver coil.
phantom No.4
/
Fix the phantom with abdominal
immobilization belt
15mm t h i c k m a t
\
50mm thick
abdominal
immobilizatio
Example phantom setting
(2)Set the following scan parameters and make three scans
without any positioning.
SLICE PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI WRAP
PRESAT.
C.POSITION
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
: TRS
: SE
: 2D
:3
: OFF
: A-P
: ON
: OFF
: OFF
: OFF
: 0
: 320
: 500
: 40
: 10
:l
:l
:2
: 256
5 - 15
156 L2E-EM0434
5.3.3 Check of S/N ratio when joint coil is used
Similarly to the 4check of the head coil, determine the S/N
ratio.
(1)Place the adjusting phantom (No.2, 121 dia.) and cover
the phantom with the receiver coil.
phantom
Abdomen
immobili
P i l l .ou matt
(70
J
itatt
Example
phantom
setting
(2)Set the following scan parameters and make three scans
without any positioning.
SCAN PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI-WRAP
: TRS
: SE
: 2D
:3
: OFF
: A-P
: OFF
: OFF
: OFF
PRESAT.
:
OFF
C.POSITION
FOV
TR
:
0
TE
THICKNESS
MULTI
SLICE
ECHO
NSA
PROJECTION
:
260
: 500
: 40
:5
:l
: 1
:2
: 256
5 - 16
157
L2E-BM0434
5.3.4 Check of S/N ratio when large flexible body coil is used
Similarly to the check of the head coil, determine the S/IQ&:/
ratio.
(1)Place the adjusting phantom (No.4)
phantom with the receiver coil.
and
cover
the
(a)connector No. 1
5Omm
thick 1
I
----se--
(b)Connector
/
I
phantom No. 4
1J
No. 2, 3
phantom No. 4
5omm
mat
5O~mn
thick mat
15mm thic
mat
/ (double)
(c)connector No. 4
70mm thick
pillow mat
phantom No. 4
5Omm thick
mat
Omm thick rat
15mm thick
Jmat
(double)
Example phantom setting
5 - 17
h&)'
158 L2E-BM0434
(2)Set
the following scan parameters
without any positioning.
SCAN PLANE
SEQUENCE
2D/3D
SEQ.
No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI - WRAP
PRESAT.
C.POSITION
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
and
make
three
scans
: TRS
: SE
: 20
:3
: OFF
: A-P
: ON
: OFF
: OFF
: OFF
: 0
: 320
: 500
: 40
: 10
: 1
: 1
:2
: 256
5 - 18
159 L2E-BM0434
5.3.5 Check of S/N ratio when small flexible body coil is used
,( :-"+\
&
Similary to the check of the head coil, determine the S/h
ratio.
(1)Place the adjusting phantom (No.4, No.31 and cover the
phantom with the receiver coil.
(a)connector No.1
/
phantom
No.3
70mm thick
pillow mat
(b)connector No.2,3,4
/phantom
No.4
Example phantom setting
5 - 19
160 L2E-BM0434
(2)Set the following scan parameters and make three scans
without any positioning.
SCAN PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI WRAP
PRESAT.
C.POSITION
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
: TRS
: SE
: 2D
:3
: OFF
: A-P
: ON
: OFF
: OFF
: OFF
: 0
: 320 (260mm in case connector No.1)
: 500
: 40
: 10 (5mn in case connector No.1)
: 1
: 1
:2
: 256
5 - 20
.
161 L2E-BM0434
5.3.6 Check of S/N ratio large extremity coil is used
Similary to the check of the head coil, determine the S,-)
ratio.
(1) Place the adjusting phantom (No.2)
phantom with the receiver coil.
,
70n IUII thick
pi‘llow m. a t
phantom
and
cover
the
No.2
immobilization
15mm thick mat
Same in
5Omm
Example phantom setting
(2)Set the following scan parameters and make three scans
without any positioning.
SCAN PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI WRAP *
PRESAT.
C.POSITION
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
: TRS
: SE
: 2D
: 3
: OFF
: A-P
: OFF
: OFF
: OFF
: OFF
: 0
: 260
: 500
: 40
: 5
:l
:l
:2
: 256
5 - 21
1 6 2 LZE-BM0434
5.3.7 Check of S/N ratio when small extremity coil is used
Similary to the check of the head coil, determine the S/N
ratio.
(1)Place the adjusting phantom (No.2)
phantom with the receiver coil.
70mm thick
and
cover
the
2Omm thick abdominal
immobilization
15mm thick mat
Example phantom setting
(2)Set the following scan parameters and make three scans
without any positioning.
SCAN PLANE
SEQUENCE
2D/3D
SEQ. No.
REPHASE
PHASE DIR.
REJECTION
RECTANG.
ANTI-WRAP
PRESAT.
C.POSITION
FOV
TR
TE
THICKNESS
MULTI SLICE
ECHO
NSA
PROJECTION
l
: TRS
: SE
: 2D
:3
: OFF
: A-P
: OFF
: OFF
: OFF
: OFF
: 0
: 260
: 500
: 40
:5
:l
: 1
:2
: 256
5 - 22
163
L!2E-BM0434
5.4 Check of background noise
(1)Compare the images obtained by scans taken during the S/N
A+
d..l
ratio (signal-to-noise ratio) check and images of which
the S/N ratio were measured at the time of shipment from
factory and which are stored in the OD accessory to the
system (these images were obtained by scans with the same
parameters).
(2)Adjust the window level and width so that the back-ground
of the image is seen, and referring to the images taken
at the shipment from factory, make sure that the image is
free from zonal noise, streak noise and other artifacts.
(3)Write into the recording sheet the state of the image
background such as existence or nonexistence of zonal
noise, streak noise or.other artifacts.
.a .-
I.
I
f
Streak
noise
5 - 23
Zonal n o i s e
164 L2E-BM0434
Section VI
ReferenceMaterials
--.
6.1 Connection between multi-format camera and central control
console
The connection between the multi-format camera and central
control console can be connected so that the power switch
of the multi-format camera can be turned ON and OFF in
The connection can,
interlock with the MRI system.
however, be made only for AC 200V power supply voltage.
Disconnect
terminator, and
connect coaxial
cable instead.
Uultiformat camera
Coaxial cable,
multiformat
camera
Provide
terminator
Filter
GND
cable, accessory to
-
box
I
T o BSRI u n i t
6 -1
165 L2E-EM0434
6.2 Filming of test pattern by multiformat camera
6.2.1Procedure
(l)Read an image from the following image OD accessory to
thesystem:
MRP SMPTE TEST PATTERNS
(2)Press
the DISPLAY button to display the image.
(3)Press the SELECT MODE key, type in "7" and press the
ENTER key to start the AUTO WINDOW selecting process.
In response to a message displayed, type in "1" and
press the ENTER key to select the normal window.
(4)Press the U/L, WINDOW key to take a preset window for
display of the test pattern image.
(5)Select the standard format (number of frames) of the
Unless otherwise specified,
multiformat camera used.
:'
the format is 9 frames (on 11x14" film), 4 or 6 frames
wli
(on 8x10" film).
(6)Write the date of filming into the image by the comment
process or write it in the circumferential margin of
the film using a magic ink.
NOTE: l.The filming is to be done when more than 30 min
has passed after the power supply to the
multiformat camera is turned on.
2.After
an intended filming, take the similar
procedure to that at step (3) to start the AUTO
WINDOW selecting process, thereby restoring the
auto window state.
6-2
1 6 6 UE-BM0434
6.3 Performance data
6.3.1 FOV accuracy
(1)SE sequence
Less than +/-1.5% for all the transverse, sagittal and
coronal planes
(2)GE sequence
Less than +/-1.5% for all the transverse, sagittal and
coronal planes
6.3.2 Geometrical distortion
‘Less than 90 +/- 2.0 for all the transverse, sagittal and
coronal planes
6.3.3 Signal-to-noise ratio (S/N ratio)
Should be as shown in the graphs given below.
6.3.4 Background noise
Compare the images obtained during the S/N ratio check and
the S/N ratio check images in the accessory OD (S/N ratio
No zonal noise,
check done at shipment from factory).
linear noise or other artifact should be found in the
images.
6 -3
1 6 7 LZE-BM0434
23(
22c
m---m--
:
:
I
I
:
I
I
:
I
:
I
I
41
-----,1,,,-,,,-,,,,1----,
-,,,:-,-I
I
I
I
\
I
I
I
210
I
I
:
t
I
I
:
t
I
,,----I----,,,,,-,,~,,,,,,,,,,,,,
I
I
I
I
I
200
I
I
I
I
- - - - - -
190
i
I
I
i------------~-------------
I
I
:
I- - - - - - I
:
I
1
I
: - - - - - - I
f
I
t
I
r
I
I
I
I
I
I
I
I
I
I
------f------i--------- --------
180
I
I
:
:
I
I
I
I
I
I
I
I
170
160
--
150
-.e
0
Lower l&it
0
,I
20
25
30
Temp. ("C)
Reference range of S/N ratio when HS/MR Head receiver coil
is used (SE 500/40, 1 slice, 1 echo)
6 - 4
168 L2E-BM0434
,
230
220
210
I
I
I
I
,
i
I
I
I
i
I
:
i
I
,,,,,-I,,-,,--,-,,- J ,,,,,,,,,,,,-L,,----,
200
I
I
I
I
I
I
I
I
I
I
I
I
!
I
I
I
I
I
I
I
I
I
I
I
I
I
:
-m---e ~------------~-------------‘-------
190
I
I
I
I
I
--s-s- : ------------~-------------
180
i
I
i
I
I
I
I
I
I
I
I
:
I
I
I
I
:
------r-------------~-------------'
170
I
I
!
I
I
-------
t
I
:
I
I
:
r------I
I
I
160
150
rc
Lower limit
0
0
.,
20
25
30
Temp. ('C)
Reference range of S/N ratio when HS/MR Head receiver coil
is used (SE 1500/40, 8 slices, first one of two echoes)
6 - 5
1 6 9 ME-BMO434
80
limit
_-------
75
0
70
Z
‘1
m
65
60
55
i
------+---------w-I
50
i
i
..#-------------c - - - - - - I
I
c
c
0
0
\\
20
25
Temp.
30
(“C)
Reference range of S/N ratio when HS/MR Head receiver coil
is used (SE 1500/40, 8 slices, second one of two echoes)
f
-
c
*7n
1 ?P.RMrldRd
280 -
;
I
I
;
I
1
I
,
I
I
I
i
i
i
I
260 -
i
0
i
i
240 -
i
,
--,,,-A,,,,,,-,
i
. .
I
-,~--,,-,-------L-------
220 -
------&--j - - - - - - -
i
200 -
i
I
iI
I
,,,,,,l,,,,,-,,,,,,J,,,-,,,,,,-,,
I
I
i- - - - - - ,
.i
I
I
180 -
------ 3------------~-------------~-------
I
160 -
------
f
p+& ------8 Lower limit
I
140 -
I
I
I
I
I
I
I
I
-
0L
0
I
I
I *
20
25
30
Temp.
("C)
Reference range of S/N ratio when HS/MR body receiver coil
is used (SE 500/40, 1 slice, 1 echo)
6 - 7
171 L!ZE-BM0434
280
I
I
I
I
I
260
I
I
I
I
I
I
I
I
I
I
I
- - - - - - a.------------ J-----------I
I
I
I
:
I
f
t
Upper-limit
240
---s-e
I
I
I
i
:- - - -- - I
I
I
I
:
L- - - - - - I
I
I
:
I
:- - - - -- I
220
i
I
I
:
I
I
I
i
i
- - - - - - : _-----_----- :---------I
I
I
I
I
I
t
I
I
I
200
180
----me
160
- - - - - -
I
I
:
I- - - - - - I
I
I
:
I
I
I
f - - - - - - - - - - - - ~ - - - - - - - - - - - - - l - - -: - - - I
1% - - - -
I
I
Lower limit I
I
I
I
I
I
~-------
I
I
I
i
-----a‘-“-‘T’--“--‘-“‘;--“----------t-
0
..
25
20
30
Temp. ("Cl
Reference range of S/N ratio when joint receiver coil is
used (SE 500/40, 1 slice, 1 echo)
.
6 -a
1 7 2 L2E-BM0434
.
.- -
24t
I
I
;
I
:
:
I
I
!
,
:
1
8
------L------------~-------------
220
I
I
I
I
0
.+
cu
L
200
t
tn
180
I
t
I
I
r
1
I
I
I
I
I
: - - - - - -I
I
I
,
------ ~pz& ------I
I
:
:
:
I
I
I
I
,-,-,,I,,-,,,,-,,,,~,-,-,,---,-,,
:- - - -- - iI
t
I
t0
I
III
I
!I
1I
II
I
-----+---------------------I------I
I
I
:I
I1
II
,
I,
:
:
;
----k
----------~------------- I- - - - - - II
,!
I
I
I
160
140
+J
m
120
I Lover limit I
1
------ i -------------~-------------
:
;- - - - - - -
100
_----- f----+-- -- - - - - --- - ; - - - - - -cc
0
0
\\
20
25
30
Temp. ('C)
.
Reference range of S/N ratio when flexible large body
receiver coil is used (SE 500/40, 1 slice, 1 echo)
6 - 9
173 LZE-BM0434
220
I
I
I
I
: -- -- -- ~------------~----------------a-
200
I
I
0
.+
lu
L
I
I Upper limit ,
I
I
/
I
I
,,,-,,J.----,-,-,a------------I
i
I
I
I
:
Ii
I
I
I
180
--..,,,I---,--,----- j-----------
160
I
i
I
I
I
I
8
I
I
,,,,,-I,,,,,,-----1
I
140
I
I
I
I
120
------
I
I
I
I
L- - - -- - I
I
:
I
I
L,,,,,-I
I
:
I
I
I
I
~----------
; -- -- -- -
I
I
I
I
I
I
:
I
I
~~-j
I
I
t
I
:
:
----me -------------~------------f
100
I
:
-------
I
I
I
t
-------
80
.*
0
\\
cl
.a
20
25
Temp.
30
("C)
Reference range of S/N ratio when flexible small body
receiver coil is used (SE 500/40, 1 slice, 1 echo)
(Connector No.1)
6 - 10
174 L2E-$M0434
240
I
I
I
;
I
I
;
I
I
I
I
I
I
I
I
I
I
: --s---I
:
I
I
Upper limit
I
-------L---------- -4------------I
J :
:
I
:
220
I
I
I
:
I
:
I
,-,,-,I-,-,-,,,-,,,~-,,,,,,------------
\
200
I
I
I
I
I
I
1
i
:
r
I’
I
I
I
-,---,L-,--,-,--,-,~-,,-,,,--,,,-L
180
: - - - - - - -
I
I
I
i
I
I
-----mm
I
I
i
I
1
I’
I
I
t
I
160
- - - - - -
140
~*--j
.
.
I
,
---em..
120
i
:
:
“‘-““““-,“““‘““”
I
I
I
I
:
I
I
I
----+-------
100
..
I
! - - - - - - I
I
I
1
.
cc
0
I
I
;-------------f-------
l
0
- - - - - - -
20
25
30
Temp. ("C)
Reference range of S/N ratio when flexible small body
receiver coil is used (SE 500/40, 1 slice, 1 echo) ,
(ConnectorNo.2-4)
6 - 11
176 LZE-BM0434
,
S t a n d a r d r a n g e o f S/N r a t i o
---------I----------, i --------- ~----.I
;
II
,
i
I
I
I
I
I
t
I
I
I
I
I
I
I
I
I
I
I
!
I
- - - t----------:---------:---------i---------~--------I
I
I
I
I
I
I
I
I
I
I
f
I
I
I
I
I
I
I
I
I
f
I
I
I
I
i
i
I
I
I
I
““““‘~“^“““~“““---’
I
I
I
I
I
I
I
I
I
.
320
I
------a.--I
I
I
I
300
Upper limit
I
----w ~-------------L------1
3' II
I
I
:
I
I
I
:
I
---,,,I,,,,-,-,-,,,~,,,----------L
\
280
I
I
I
:
I
I
I
I
I
-----me
:
I
1
I
260
--m-e- .----,,-----,~-------------
i
I
I
1
I
I
i
I
: - - - - - - f
I
I
i
i
I
:
I
--,,,,I,,-,,,,,,,..,
I
240
L
-0
G
-0
220
-mm-
t
lu
+
*
m
------i-------------i-------------;-------
200
i
------‘-----------,-------------t------T.
180
II
0
0
\.
20
25
30
Temp. ('C)
range of S/N ratio when extremity small receiver
coil is used (SE 500/40, 1 slice, 1 echo)
Reference
6 - 13
1 7 7 L!2E-EM0434
6.4 Recording sheets
Adjustment Certificate/Data Recording Sheet
1.
2.
3.
Heater current (see item 4.4.1)
- Upper system
(7.0 to 9.0 A)
- Lower system
(10.0 to 12.5 A)
Magnetic circuit temperature (see item 4.4.2)
- Upper magnet thermistor
(808 to 844Q)
- Lower magnet thermistor
(808 to 84452)
- Difference between upper and lower
(less than 9Q)
Static field homogeneity (see item 4.5)
4
4.
5.
(less than 60 ppm)
Transmitter coil tuning (see item 4.7.1)
- Impedance
(SOilO~)
-
(00f100)
Phase
Receiver coil tuning (see item 4.7.2)
solenoid saddle
- HS/MR Head
- HS/MR Body
- Joint/NecK
Impedance
(200lt100R)
Phase
(O"flOo)
Tuned value
(OC to 4E)
Impedance
(200f100R)
Phase
(00f100)
Tuned value
(OC to 4E)
Impedance
(60~15Ofi)
Phase
(OOflOO)
Tuned value
(OC to 36)
6- 14
178 LZE-BM0434
- Large Extremity
- Impedance
- Phase
- Tuned value
- Small Extremity
- Impedance
- Phase
- Tuned value
- Large Flexible Body
No.1 No.2 No.3 No.4
- Small Flexible Body
l
Connector No.1 - Impedance
(550+1ofi)
- Phase
(215O)
- Tuned value
(OC-72)
6 - 15
179 I+-ml0434
6.
Transmission gain and bias and offset (see item 4.8)
- Bias
- Gain
- Offset
Coil No.
1
7.
Adjustment
value
Coil No.
l
Adjustment
value
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
FOV (see item 4.10)
- X axis (P encoded)
(100.0f0.2
- Y axis (P encoded)
(100.0f0.2 mm)
- Z axis (P encoded)
(100.0f0.2 mm)
6 - 16
mm)
180 L!%BM0434
GC gain adjustment value:
Axis
Slicing
Spin echo
Gradient echo
X
Y
Phase
encoding
X
Y
Frequency
encoding
X
.-
HZ
10. Center frequency
6 - 17
1 8 1 LZEBM0434
Image quality check recording sheet
1.
FOV accuracy check
1.1 Sequence SE
- Slice plane Coordinates : FOV accuracy (less than 1.5% in
reference value)
- Transverse
- Sagittal
- Coronal
X direction :
% (frequency encoding)
Z direction :
% (phase encoding)
Y direction :
% (frequency encoding)
Z direction :
% (phase encoding)
X direction :
% (phase encoding)
Y direction : '
% (frequency encoding)
1.2 Sequence GE
- Slice plane Coordinates : FOV accuracy (less than 1.5% in
reference value)
*'j
- Transverse
- Sagittal
- Coronal
2.
X direction :
% (frequency encoding)
Z direction :
% (phase encoding)
Y direction :
% (frequency encoding)
Z direction :
% (phase encoding)
X direction :
% (phase encoding)
Y direction :
% (frequency encoding)
Distortion check
- slice plane
Intersection angle (900+/-2.0° in reference
value)
0
- Transverse
:
- Sagittal
:
0
- Coronal
:
0
6
- 18
182 L2E-BM0434
3.
S/N ratio
J
3.1 When HS/MR Head receiver coil is used:
3.1.1 SE 500/40 1 slice, 1 echo
- S/N ratio
:
- Phantom temperature
:
- Reference range of S/N ratio :
- Tuned value
:
- Gain
:
- Center frequency
:
OC
max.
min.
3.1.2 SE 1500/40 8 slices, 2 echoes
* First echo:
- S/N ratio
:
- Phantom temperature
:
- Reference range of S/N ratio :
- Tuned value
:
- Gain
:
- Center frequency
:
OC
min.
max.
min.
max.
* Second echo:
:
- S/N ratio
- Reference range of S/N ratio :
6 - 19
183 L2E-BM0434
3.2 When HS/MR body receiver coil is used (SE 500/40
echo):
- S/N ratio
:
- Phantom temperature
:
:
- Gain
:
- Center frequency
:
3.3 When joint receiver
echo):
max.
min.
coil is used (SE 500/40
- S/N ratio
:
- Phantom temperature
:
:
- Gain
:
- Center frequency
:
1 slice, -1
OC
max.
min.
- Ref. range of S/N ratio :
- Tuned value
.""
dj
OC
- Ref. range of S/N ratio :
- Tuned value
1 slice, 1
3.4 When large flexible body receiver coil is used (SE
slice , 1 echo):
500/40
Connector
I - S/N ratio II
I - Tuned value II
I- Gain
- Phantom temperature
I
I
I
I
I
I
I
I
I
I
I
OC
:
- Ref. range of S/N ratio :
- Center frequency
I
I
min.
max.
:
6 - 20
184 LZE-BM0434
1
3.5 When small flexible body receiver coil is used (SE 500/40
slice, 1 echo):
1
.- --.
No.1 No.2
Connector
- S/N ratio
- Tuned value
- Gain
- Ref. range of S/N ratio -
- Phantom temperature
:
- Center frequency
:
-
OC
3.6 When large extremity receiver coil is used (SE 500/40
slice, 1 echo):
- S/N ratio
:
- Phantom temperature
:
- Ref. range of S/N ratio :
- Tuned value
:
- Gain
:
- Center frequency
:
1
OC
min.
max.
3.7 When small extremity receiver coil is used (SE 500/40 1
slice, 1 echo):
- S/N ratio
:
- Phantom temperature
:
- Ref. range of S/N ratio :
- Tuned value
:
- Gain
:
- Center frequency
:
6 - 21
OC
min.
max.
185 L2E-BM0434
4.
Background noise check
.-.
6 - 22
166
L!ZE-BM0434