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Computed Tomography for Technologists 2nd Edition Exam Review (Latest Update 2025)
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Computed Tomography for Technologists 2nd Edition Exam Review (Latest Update 2025)
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Computed Tomography for Technologists2nd Edition Exam Review (Latest Update
2025)
Which is NOT a synonym for the preliminary/localizer image
taken at the start of a CT examination?
A. Topogram
B. Scout
C. Scanogram
D. Spiral - Correct Answer ✅D. Spiral
The ability of a system to differentiate, on the image, objects
with similar densities is known as:
A. High contrast resolution
B. Low contrast resolution
C. Spatial resolution
D. Temporal resolution - Correct Answer ✅B. Low contrast
resolution
Each two dimensional square of data that make up the CT
image is called a:
A. Pixel
B. Voxel
C. Matrix
D. Fragment - Correct Answer ✅A. Pixel
,Computed Tomography for Technologists
2nd Edition Exam Review (Latest Update
2025)
How many pixels are contained in a 1,024 matrix image? A.
1,024
B. 2,048
C. 262,144
D. 1,048,576 - Correct Answer ✅D. 1,048,576
Beam attenuation can be defined as:
A. The phenomenon by which artifacts result when lower
energy photons are preferentially absorbed, leaving only
higher-intensity photons to strike the detector array.
B. Xray energy that is produced from bombarding a
substance with fast moving electrons.
C. The ability of the detector to capture transmitted photons
and change them to electronic signals.
D. The phenomenon by which an xray beam passing through
a structure is decreased in intensity or amount because of
absorption and interaction with matter. - Correct Answer
✅D. The phenomenon by which an xray beam passing
through a structure is decreased in intensity or amount
because of absorption and interaction with matter.
Which of the following is a low attenuation structure:
A. Iodine filled aorta
B. Rib
C. Trachea
,Computed Tomography for Technologists
2nd Edition Exam Review (Latest Update
2025)
D. Calcified arteries - Correct Answer ✅C. Trachea
An object is slightly less dense than water. What is the
expected hounsfield measurement?
A. -940
B. -10
C. 50
D. 850 - Correct Answer ✅B. -10
Why does the administration of iodinated contrast media
result in an enhanced image?
A. Iodinated contrast material increases the ability of the
enhanced structure to attenuate the xray beam.
B. Iodinated contrast material decreases the average photon
energy of the xray beam; therefore more photons are
absorbed by the patient.
C. The administration of contrast material results in a smaller
pixel, thereby increasing spatial resolution, which results in
an enhanced image.
D. - Correct Answer ✅A. Iodinated contrast material
increases the ability of the enhanced structure to attenuate
the xray beam.
The xray beam sources for CT produce xray energy that is
polychromatic. This means:
, Computed Tomography for Technologists
2nd Edition Exam Review (Latest Update
2025)
A. When viewed by the naked eye, the beam exhibits many
different colors.
B. It produce, as a byproduct, a substance known as
polychlorinated biphenyl.
C. Photons contained in the beam are all of the same
wavelength.
D. The beam comprises photons with varying energies. -
Correct Answer ✅D. The beam comprises photons with
varying energies.
An object that appears on the image but is not present in the
object scanned is called a/n:
A. Artifact
B. Anomaly
C. Shadow
D. Ghost - Correct Answer ✅A. Artifact
Which is an advantage of filtering the xray beam?
A. Filtering reduces the anode heat load
B. A filtered beam produces images with substantially less
quantum mottle
C. Filtering the beam prevents energy from being converted
to heat, therefore 100% of the energy is converted to xrays.
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