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CT REGISTRY REVIEW PROGRAM POST-TEST QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CT REGISTRY REVIEW PROGRAM POST-TEST QUESTIONS AND ANSWERS WITH SOLUTIONS 2024
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CT REGISTRY REVIEW PROGRAMPOST-TEST QUESTIONS AND ANSWERS
WITH SOLUTIONS 2024
Bremsstrahlung radiation does NOT include which type of electron activity?
1. Collision between an incoming electron and the nucleus of the target atom
2. Collision between an incoming electron and an electron in an inner shell of the target atom
3. Slowing down of an incoming electron due to the effect of passing close to the positive charge of the
nucleus of the target atom - ANSWER 2 only. Collision between an incoming electron and an electron in
an inner shell of the target atom describes characteristic radiation.
Collimation is accomplished by: - ANSWER Physically blocking x-rays
Which of the following statements is FALSE regarding occurrences after an x-ray photon penetrates the
detector aperture?
1. The photon can pass through the detector unmeasured
2. The photon is converted completely into an electron
3. The measured signal is enhanced by an amplifier - ANSWER 2 only
Which of the following utilizes convolution?
1. 3D SSD
2. Fourier Transform
3. Filtered back projection - ANSWER 3 only. Filtered back projection
In which technique are tissues other than the surface of a structure excluded by setting a threshold value
and eliminating pixels above or below that threshold?
a. volume rendering
b. multi-planar reconstruction
c. maximum intensity projection
d. 3D shaded surface display - ANSWER D. 3D shaded surface display
Which of the following statements is TRUE?
1. The amplified electrical signal obtained from the detectors must be digitized
2. Digital CT images are numerical representations of cross-sectional anatomy
3. Digital signals may be formed by sampling analog signals at discrete time intervals - ANSWER 1, 2 & 3
A single 2D picture element within the image plane - ANSWER Pixel
The pencil thin section of the x-ray fan beam that strikes a single detector is called a: - ANSWER Ray
Determines the intensity of the laser beam in a laser camera - ANSWER Pixel values in the image data
Allows helical data to be converted into planar raw data - ANSWER Interpolation
The most common type of film used for recording CT images - ANSWER Single emulsion
, MDCT scanners capable of collecting 64 slices in a single rotation do NOT: - ANSWER Use filtered back
projection as their method of image reconstruction.
What benefits does the dual focal spot provide compared to a single focal spot? - ANSWER The number
of projections is doubled.
CT numbers ______ would appear black if a window width of 400 and a window level of -100 are used.
a. above +200
b. below -300
c. below -200
d. above +100 - ANSWER B. below -300
Which of the following is FALSE about the spatial resolution of an image?
1. resolution is dependent on matrix size
2. resolution is dependent on reconstruction FOV
3. resolution is dependent on scanned FOV - ANSWER 3 only
An increase in _____ will result in hardening of an x-ray beam.
1. tissue density
2. tissue thickness
3. kVp - ANSWER 1, 2 & 3
Which of the following will result in an increased voxel size?
1. decreased reconstruction FOV
2. increased slice thickness
3. increased matrix - ANSWER 2. Increased slice thickness.
Which of the following does NOT occur when reconstruction FOV is decreased?
1. spatial resolution is increased
2. pixel size is increased
3. noise in the image increases - ANSWER 2 only
Which of the following occurs when slice thickness is reduced?
1. appearance of noise in the image increases
2. the number of photons used in making the slice decreases
3. partial volume averaging decreases - ANSWER 1, 2 & 3
On MDCT, the final reconstructed slice thickness is determined by the:
a. number of rows of detectors and the size of the detectors whose attenuation data gets combined
b. pitch
c. reconstruction interval
d. collimation of the x-ray beam - ANSWER a. number of rows of detectors and the size of the detectors
whose attenuation data gets combined
A set of images is reconstructed with a 150mm reconstruction FOV. Keeping all other parameters
constant, a second set of images is reconstructed with a 300mm reconstruction FOV, and then magnified
so that the anatomical structures in the first and second set appear the same size. Which of the following
statements is FALSE?
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