Mosby CT Review Exam 2026 Questions
and Answers
An increase in the sampling rate during CT data
acquisition corresponds to an increase in:
a. views per rotation
b. patient radiation dose
c. image noise
d. matrix size - Correct answer-A. Views per rotation. As the sampling rate
increases, so do the views per rotation.
During volumetric CT acquisition, the slice sensitivity
profile (SSP) graphically represents the:
a. effective section width
b. dose profile
c. beam width
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,d. detector collimation - Correct answer-A. Effective section width.
This corresponds to the slice sensitivity profile (SSP) of the reconstructed section
in consideration of the widening that occurs during helical data acquisition
Which of the following is a manifestation of the partial volume artifact?
a. cupping
b. Hounsfield bar
c. aliasing
d. streaking - Correct answer-A. Cupping
The cupping artifact that occurs at the superior portion of the skull is another form
of partial volume artifact. The dense skull table averages with the low attenuating
brain tissue, causing an artifact by which the brain parenchyma may appear
abnormally dense.
Which of the following technical adjustments may
be employed to reduce step artifact in a multiplanar reformation CT image?
1. acquisition of an isotropic data set
2. overlapping section increment
3. increase in effective mAs
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, a. 1 only
b. 1 and 2 only
c. 2 and 3 only
d. 1, 2, and 3 - Correct answer-B. In modern MDCT the highest quality 3d and
MPR images are obtained with the acquisition of an isotropic or near isotropic data
set. The other equally important piece is an overlapping data set, for which
reconstruction interval is less than the section width.
In multidetector CT (MDCT), the combined thick- nesses of all of the sections
simultaneously acquired with each gantry rotation are called the:
a. detector configuration
b. beam pitch
c. detector pitch
d. total collimation - Correct answer-D-total collimation
When one is assessing a modulation transfer function (MTF) graph such as the
figure, the limiting resolu- tion is determined at a point where the signal fre-
quency corresponding to a particular object has reached:
a. 10%
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and Answers
An increase in the sampling rate during CT data
acquisition corresponds to an increase in:
a. views per rotation
b. patient radiation dose
c. image noise
d. matrix size - Correct answer-A. Views per rotation. As the sampling rate
increases, so do the views per rotation.
During volumetric CT acquisition, the slice sensitivity
profile (SSP) graphically represents the:
a. effective section width
b. dose profile
c. beam width
©COPYRIGHT 2025, ALL RIGHTS RESERVED 1
,d. detector collimation - Correct answer-A. Effective section width.
This corresponds to the slice sensitivity profile (SSP) of the reconstructed section
in consideration of the widening that occurs during helical data acquisition
Which of the following is a manifestation of the partial volume artifact?
a. cupping
b. Hounsfield bar
c. aliasing
d. streaking - Correct answer-A. Cupping
The cupping artifact that occurs at the superior portion of the skull is another form
of partial volume artifact. The dense skull table averages with the low attenuating
brain tissue, causing an artifact by which the brain parenchyma may appear
abnormally dense.
Which of the following technical adjustments may
be employed to reduce step artifact in a multiplanar reformation CT image?
1. acquisition of an isotropic data set
2. overlapping section increment
3. increase in effective mAs
©COPYRIGHT 2025, ALL RIGHTS RESERVED 2
, a. 1 only
b. 1 and 2 only
c. 2 and 3 only
d. 1, 2, and 3 - Correct answer-B. In modern MDCT the highest quality 3d and
MPR images are obtained with the acquisition of an isotropic or near isotropic data
set. The other equally important piece is an overlapping data set, for which
reconstruction interval is less than the section width.
In multidetector CT (MDCT), the combined thick- nesses of all of the sections
simultaneously acquired with each gantry rotation are called the:
a. detector configuration
b. beam pitch
c. detector pitch
d. total collimation - Correct answer-D-total collimation
When one is assessing a modulation transfer function (MTF) graph such as the
figure, the limiting resolu- tion is determined at a point where the signal fre-
quency corresponding to a particular object has reached:
a. 10%
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