Getting started guide
IMPAX Volume Viewing
MIP/MPR
This guide outlines the basic steps to perform multi-planar reconstructions (MPRs) and maximum intensity
projections (MIPs) of volumetric image data using IMPAX Volume Viewing. MPR/MIP can be used to
reconstruct volumetric image data with any obliquity in any plane.
Manipulating the crosshairs
Left mouse click anywhere on an MPR viewport to
move the crosshairs to that location. The orthogonal
MPRs will be updated accordingly.
You can also move the crosshairs by clicking and
dragging the center of the crosshairs. Notice how
the mouse cursor changes when positioned over the
center of the crosshairs.
The crosshair gap size can be adjusted with the
slider in the top toolbar.
The crosshairs can be be shown or hidden by
pressing X on the keyboard, or by clicking the
crosshair button
in the top toolbar. The
default gap size can be set with the IMPAX Volume
Viewing configuration tool.
To shift one of the crosshairs, position the mouse
cursor over it between the inner end and the middle
of a crosshair line and click & drag the crosshair.
Notice how the mouse cursor changes when
positioned over the crosshair.
To create an oblique (or double oblique)
reconstruction, you can rotate the crosshairs in one
or more planes. Position the mouse cursor over the
side of a crosshair between the middle and the
outer end of a crosshair line and click & drag to
rotate.
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Window/leveling
To adjust the window / level in a particular
viewport, click & drag the middle mouse
button (scroll wheel).
While changing the window level, the center
and width values are displayed in the bottom
status toolbar.
Other MPR viewports will update their W/L
setting to the new values when the middle
mouse button is released.
Window/level presets can be assigned to the
keyboard function keys (F1 – F12) for both CT
and MRI datasets.
Defaults (the same as in IMPAX) have been
predefined for both CT and MRI series.
To access the window level shortcut
configuration dialog, select the Window level
tool from the top toolbar.
To define a new window/level shortcut, select
a line in the table, fill in a name, width and
center values. Then click Apply to save.
In IMPAX Volume Viewing MIP/MPR, there are
two axial MPR viewports. A different
window/level can be set for both these
viewports.
Select a different screen layout via the Layout
menu in the top toolbar.
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Scrolling, zooming, panning, etc…
To scroll through MPR slices:
• click & drag on that viewport,
• use the mouse scroll wheel or
• use the up/down arrow keys.
• click & drag the corresponding crosshair
line in one of the other MPR views
To zoom or pan, activate zoom mode (via the
top toolbar, in the right-mouse-click menu or
by pressing ‘z’ on the keyboard). Then use the
mouse scroll wheel to zoom (on the centre of
the crosshairs) or click & drag to pan. Notice
the zoom/pan modes are indicated by the
mouse curser. Exit zoom mode with a rightmouse-click.
All MPR views will zoom simultaneously.
Panning only applies to the currently selected
MPR view.
To change the MPR slice orientation in a
particular viewport, select that orientation
from the viewport toolbar, or use a keyboard
shortcut to go to Axial (A), Coronal (C) or
Sagittal reformat (S).
To change the slice thickness, move the
thickness slider in the viewport toolbar, or
press a number on the keyboard for slice
thicknesses between 0 (minimum) and 9 mm.
Slice thickness
Projection mode
Slice orientation
To change the projection mode, select it from
the viewport toolbar. The following projection
modes are available:
• MIP: maximum intensity projection
• MINIP: minimum intensity projection
• AVGIP: average intensity projection
Double click on any viewport to go to a large
or full-screen view.
Press the Reset button
in the top toolbar
to undo all changes to zoom, pan,
window/level, and so on.
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Image markups
Markups are available from a drop down menu in the top toolbar.
Angle
Arrow
Distance
Ellipse
Polygon
Text
Delete markup
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