Name: ________________________ Class: ___________________ Date: __________
ID: A
Final review
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Image-forming x-rays include those which have been _____.
a. transmitted without interaction
b. scattered through Compton interaction
c. absorbed through photoelectric interaction
d. all the above
____
2. Which kVp selection would result in the most scattered x-rays in the image-forming beam?
a. 90 kVp
c. 60 kVp
b. 75 kVp
d. 50 kVp
____
3. The x-ray interaction that contributes to the white parts of the image is _____.
a. coherent scatter
c. photoelectric interaction
b. Compton interaction
d. pair production
____
4. The three primary factors influencing the intensity of scatter in the image-forming beam are _____.
a. mAs, kVp, and collimation
c. kVp, field size, and patient thickness
b. mAs, filtration, and grids
d. filtration, patient thickness, and mAs
____
5. Photoelectric interactions increase when _____ is decreased.
a. mAs
c. filtration
b. patient thickness
d. kVp
____
6. Scatter radiation increases as _____ increases.
a. photoelectric absorption
c.
b. field size
d.
filtration
contrast
____
7. The most commonly used beam restricting device is the _____.
a. extension cone
c. aperture diaphragm
b. variable collimator
d. compression device
____
8. The positive beam limiting device (PBL) assures that the x-ray beam is collimated to _____.
a. the exact target size
c. 14 X 17 inches
b. 25 cm X 25 cm
d. inserted cassette size
____
9. ALARA stand for
a. As Little Active Radiation Allowed
b. As Low As Reasonable Achievable
c.
d.
Active Limits Around Radiation
Always Limits Active Radiation
____ 10. Three main ways to limit radiation exposure is to control
a. time, distractions, sound emission
c. time, distance, shielding
b. through-put, distance, shielding
d. time, duration, shielding
1
Name: ________________________
ID: A
____ 11. Computed radiography screens respond to radiation with _____.
a. fluorescence
c. photostimulable luminescence
b. electron emission
d. biological phosphorescence
____ 12. The computed radiography cassette is called a(n) _____ plate.
a. optical
c. laser
b. imaging
d. thermoluminescent
____ 13. In a CR cassette reader, optical filters are used to filter out the _____ light and allow the _____ light
to reach the photodetector.
a. stimulating, emitted
b. emitted, stimulated
c.
d.
emitted, monochromatic
stimulating, monochromatic
____ 14. The principal source of noise in computed radiography is _____.
a. scatter radiation
c. computer noise
b. background radiation
d. phosphor scatter
____ 15. The laser beam must be less than 100 nm in order to maintain _____.
a. consistent beam shape
c. high spatial resolution
b. smooth image edges
d. high speed
____ 16. In digital radiography, the brightness of the image is determined by _____.
a. pixel values
c. automatic brightness control
b. Hounsfield units
d. grid ratio
____ 17. The component used to convert radiation to visible light in DR is the
a. charge coupled device
c. RIS
b. scintillator
d. PACS
____ 18. PACS stands for
a. Picture Assesment Computer System
b. Picture Archival and Communication
System
____ 19. DICOM stands for
a. Diagnostic Imaging and Communication
in Medicine
b. Diagnostic Information and
Communication in Medicine
c.
d.
Procedure Assesment Control System
Physician Appointment Control System
c.
Direct Information Control in Medicine
d.
Digital Imaging Control in Medicine
____ 20. All of these are common safety items on a Fluoroscopy system except
a. exposure timer
c. lead shielding / aprons
b. dead-man style switch
d. cassette detection
____ 21. A fluoroscopy-specific item used to aid in ALARA is the
a. lead shielding
c. door interlock
b. exposure timer
d. tube chiller
2
Name: ________________________
ID: A
____ 22. Automatic Brightness Stabilization in fluoroscopy adjusts _______ to maintain image brightness
a. rotor prep time
c. mAs
b. mA
d. time
____ 23. The time-interval delay mode is principally used in _____ imaging.
a. renal angiography
c. cardiac
b. barium enema
d. run-off
____ 24. Remasking may be required due to _____.
a. noise artifacts
c.
b. motion artifacts
d.
technical factors
any of the above
____ 25. Energy subtraction technique takes advantage of the difference in _____ during contrast injection.
a. tissue density
c. Compton scatter
b. Z effective values
d. patient thickness
____ 26. What is the principal disadvantage of third generation CT scanners?
a. slow speed
c. patient dose
b. ring artifacts
d. poor reconstruction
____ 27. Many CT x-ray tubes have the capacity for millions of _____ with each exam.
a. heat units
c. volts
b. rotations
d. Hertz
____ 28. The patient dose in CT is determined by the _____ collimator.
a. predetector
c. postpatient
b. prepatient
d. both A and B
____ 29. Each pixel of information in the CT image contains numerical information in _____ units.
a. voxel
c. Hounsfield
b. reconstruction
d. pixel
____ 30. The CT scanner must be calibrated so that _____ represents a CT number of zero.
a. water
c. nylon
b. Plexiglas
d. polyethylene
____ 31. On a CT system, the high voltage generator is located
a. in the electronics cabinet in the room
c. under the patient table
b. on the gantry
d. on the gantry support structure
____ 32. The radiology specific Federal standard all x-ray systems must meet is
a. NFPA 99
c. 22 AEC
b. 21 CFR
d. 62 TRNS
____ 33. Which of the following readings must be taken invasively?
a. kV
c. time
b. mA
d. AEC response
3
ID: A
Final review
Answer Section
MULTIPLE CHOICE
1.
2.
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30.
31.
32.
33.
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D
A
C
C
D
B
B
D
B
C
C
B
A
A
C
A
B
B
A
D
B
B
C
D
B
B
A
B
C
A
B
B
B
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