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COMPUTED TOMOGRAPHY TEST PREP QUESTIONS AND ANSWERS
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COMPUTED TOMOGRAPHY TEST PREP QUESTIONS AND ANSWERS
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CT BOARD REVIEW - MEDICAL CTREGISTRY EXAM REVIEW QUESTIONS
WITH COMPLETE SOLUTIONS
What is an advantage of scans of the pituitary taken in the coronal plane?
A.) IV contrast material is better visualized.
B.) Streak artifacts are reduced or eliminated.
C.) The patient is more comfortable during scanning.
D.) The patient receives a lower radiation dose. - Answer-B.) Streak artifacts are
reduced or eliminated.
Which two strategies can reduce the effect of dental fillings in a sinus study?
A.) High mA and short scan time.
B.) Low kVp and high contrast, or bone algorithm.
C.) Adjust the angle of the gantry and widen the window width.
D.) Small focal spot and small display field. - Answer-C.) Adjust the angle of the gantry
and widen the window width.
Which of the following conditions may be visualized in a CT study of the brain?
A.) Glioblastoma
B.) Wilm's Tumor
C.) Krukenberg Tumor
D.) Plasmacytosis - Answer-A.) Glioblastoma
Which of the following is affected by the slice spacing in a CT study?
A.) Spatial Resolution
B.) Quantum Mottle
C.) Radiation Dose to the Patient
D.) Signal-to-Noise Ration - Answer-C.) Radiation Dose to the Patient
What is the name of the pinecone-shaped structure of the brain the can often be seen
as calcified in CT images? - Answer-Pineal Gland
Third generation (rotate/rotate) scanners overcame which of the following limitations?
A.) Detector singal drift sensitivity
B.) Translation motion
C.) Spurious signals from moving signal wires
D.) Cost - Answer-B.) Translation motion
What helical or spiral computed tomography term is defined as the table increment in
distance per mm per 360 degrees gantry rotation divided by the section thickness in
mm? - Answer-Pitch
, What determines the section thickness? - Answer-Incident beam collimation
What effect would an array processor failure have on image processing? - Answer-
Increase image display time.
What change will occur in the number of detected photons if a section thickness is
changed from 5 mm to 10mm? - Answer-Increase 100%
Which of the following will magnify the image?
A.) Increase the field of view.
B.) Decreasing field of view.
C.) Increasing section thickness.
D.) Decreasing section thickness. - Answer-D.) Decreasing field of view.
Which of the following is convolution?
A.) Filtered back projection
B.) Fourier transform
C.) Iterative filtration
D.) 3-d rendering - Answer-A.) Filtered back projection
Which of the following determines the maximum number of shades of gray that can be
displayed on the CT monitors?
A.) Window level
B.) Window width
C.) Pixel size
D.) Matrix size - Answer-B.) Window width
Which of the following are benefits of narrower section thicknesses?
Reduced partial volume averaging and improved spatial resolution
Decreased scan time, and more anatomy covered - Answer-Reduced partial volume
averaging and improved spatial resolution
Which of the following is the term used to describe a voxel value that is the average of
multiple tissue types contained within the voxel?
A.) Linear attenuation coefficient.
B.) Partial volume averaging.
C.) Low contrast resolution.
D.) Edge gradient averaging. - Answer-Partial volume averaging.
Which of the following CT numbers would appear as a gray shades when a window
width of 300 and a window level of 0 are selected?
A.) Ct numbers above +300
B.) Ct numbers between +150 and +300
C.) Ct numbers between +150 and -150
D.) Ct numbers below -150 - Answer-C.) Ct numbers between +150 and -150
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