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CT TEST REVIEW (TEST Q'S AND A'S FOR CT REGISTRY PREP. THIS IS FROM THE BOOK "COMPUTED TOMOGRAPHY FOR TECHNOLOGISTS: EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUWER, LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RATED 100% C€14,64
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CT TEST REVIEW (TEST Q'S AND A'S FOR CT REGISTRY PREP. THIS IS FROM THE BOOK "COMPUTED TOMOGRAPHY FOR TECHNOLOGISTS: EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUWER, LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RATED 100% C
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CT REGISTRY
CT TEST REVIEW (TEST Q'S AND A'S FOR CT REGISTRY PREP. THIS IS FROM THE BOOK "COMPUTED TOMOGRAPHY FOR TECHNOLOGISTS: EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUWER, LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RATED 100% C
CT TEST REVIEW (TEST Q'S AND A'S FOR CT
REGISTRY PREP. THIS IS FROM THE BOOK
"COMPUTED TOMOGRAPHY FOR
TECHNOLOGISTS: EXAM REVIEW" BY LOIS E
ROMANS. PUBLISHED BY WOLTERS KLUWER,
LIPPINCOTT WILLIAMS AND WILKINS.)
QUESTIONS & ANSWERS RATED 100% C
Which is NOT a synonym for the preliminary/localizer image taken at the start of a CT
h h h h h h h h h h h h h h h
examination?
h
A. Topogram
h
B. Scout
h
C. Scanogram
h
D. Spiral - ANS-D. Spiral
h h h h
The ability of a system to differentiate, on the image, objects with similar densities is
h h h h h h h h h h h h h h
known as:
h h
A. High contrast resolution
h h h
B. Low contrast resolution
h h h
C. Spatial resolution
h h
D. Temporal resolution - ANS-B. Low contrast resolution
h h h h h h h
,Each two dimensional square of data that make up the CT image is called a:
h h h h h h h h h h h h h h
A. Pixel
h
B. Voxel
h
C. Matrix
h
D. Fragment - ANS-A. Pixel
h h h h
How many pixels are contained in a 1,024 matrix image? A. 1,024
h h h h h h h h h h h
B. 2,048
h
C. 262,144
h
D. 1,048,576 - ANS-D. 1,048,576
h h h h
Beam attenuation can be defined as:
h h h h h
A. The phenomenon by which artifacts result when lower energy photons are
h h h h h h h h h h h
preferentially absorbed, leaving only higher-intensity photons to strike the detector array.
h h h h h h h h h h h
B. Xray energy that is produced from bombarding a substance with fast moving electrons.
h h h h h h h h h h h h h
C. The ability of the detector to capture transmitted photons and change them to
h h h h h h h h h h h h h
electronic signals.
h h
D. The phenomenon by which an xray beam passing through a structure is decreased in
h h h h h h h h h h h h h h
intensity or amount because of absorption and interaction with matter. - ANS-D. The
h h h h h h h h h h h h h
phenomenon by which an xray beam passing through a structure is decreased in intensity
h h h h h h h h h h h h h h
or amount because of absorption and interaction with matter.
h h h h h h h h h
Which of the following is a low attenuation structure:
h h h h h h h h
,A. Iodine filled aorta
h h h
B. Rib
h
C. Trachea
h
D. Calcified arteries - ANS-C. Trachea
h h h h h
An object is slightly less dense than water. What is the expected hounsfield measurement?
h h h h h h h h h h h h h
A. -940
h
B. -10
h
C. 50
h
D. 850 - ANS-B. -10
h h h h
Why does the administration of iodinated contrast media result in an enhanced image?
h h h h h h h h h h h h
A. Iodinated contrast material increases the ability of the enhanced structure to attenuate
h h h h h h h h h h h h
the xray beam.
h h h
B. Iodinated contrast material decreases the average photon energy of the xray beam;
h h h h h h h h h h h h
therefore more photons are absorbed by the patient.
h h h h h h h h
C. The administration of contrast material results in a smaller pixel, thereby increasing
h h h h h h h h h h h h
spatial resolution, which results in an enhanced image.
h h h h h h h h
D. - ANS-A. Iodinated contrast material increases the ability of the enhanced structure to
h h h h h h h h h h h h h
attenuate the xray beam.
h h h h
The xray beam sources for CT produce xray energy that is polychromatic. This means:
h h h h h h h h h h h h h
A. When viewed by the naked eye, the beam exhibits many different colors.
h h h h h h h h h h h h
, B. It produce, as a byproduct, a substance known as polychlorinated biphenyl.
h h h h h h h h h h h
C. Photons contained in the beam are all of the same wavelength.
h h h h h h h h h h h
D. The beam comprises photons with varying energies. - ANS-D. The beam comprises
h h h h h h h h h h h h
photons with varying energies.
h h h h
An object that appears on the image but is not present in the object scanned is called a/n:
h h h h h h h h h h h h h h h h h
A. Artifact
h
B. Anomaly
h
C. Shadow
h
D. Ghost - ANS-A. Artifact
h h h h
Which is an advantage of filtering the xray beam?
h h h h h h h h
A. Filtering reduces the anode heat load
h h h h h h
B. A filtered beam produces images with substantially less quantum mottle
h h h h h h h h h h
C. Filtering the beam prevents energy from being converted to heat, therefore 100% of the
h h h h h h h h h h h h h h
energy is converted to xrays.
h h h h h
D. Filtering reduces the radiation dose to the patient. - ANS-D. Filtering reduces the
h h h h h h h h h h h h h
radiation dose to the patient
h h h h h
Scan thickness is primarily important for the part it plays in:
h h h h h h h h h h
A. Noise reduction
h h
B. The contrast scale
h h h
C. Detector aperture opening
h h h
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