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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€12,70
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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 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 TECHNOLOGIS
EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUW
LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RAT
100% C
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1. Which is NOT a synonym for the preliminary/localizer D. Spiral
image taken at the start of a CT examination?
A. Topogram
B. Scout
C. Scanogram
D. Spiral
2. The ability of a system to differentiate, on the image, B. Low contrast
objects with similar densities is known as: resolution
A. High contrast resolution
B. Low contrast resolution
C. Spatial resolution
D. Temporal resolution
3. Each two dimensional square of data that make up A. Pixel
the CT image is called a:
A. Pixel
B. Voxel
C. Matrix
D. Fragment
4. How many pixels are contained in a 1,024 matrix im- D. 1,048,576
age? A. 1,024
B. 2,048
C. 262,144
D. 1,048,576
5. Beam attenuation can be defined as: D. The phenom-
A. The phenomenon by which artifacts result when enon by which
lower energy photons are preferentially absorbed, an xray beam
leaving only higher-intensity photons to strike the passing through a
detector array. structure is de-
B. Xray energy that is produced from bombarding a creased in intensi-
substance with fast moving electrons. ty or amount be-
C. The ability of the detector to capture transmitted cause of absorp-
photons and change them to electronic signals.
, CT TEST REVIEW (TEST Q'S AND A'S FOR CT REGISTRY PREP. THIS
IS FROM THE BOOK "COMPUTED TOMOGRAPHY FOR TECHNOLOGIS
EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUW
LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RAT
100% C
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D. The phenomenon by which an xray beam pass- tion and interac-
ing through a structure is decreased in intensity or tion with matter.
amount because of absorption and interaction with
matter.
6. Which of the following is a low attenuation structure: C. Trachea
A. Iodine filled aorta
B. Rib
C. Trachea
D. Calcified arteries
7. An object is slightly less dense than water. What is B. -10
the expected hounsfield measurement?
A. -940
B. -10
C. 50
D. 850
8. Why does the administration of iodinated contrast A. Iodinated con-
media result in an enhanced image? trast material in-
A. Iodinated contrast material increases the ability of creases the abili-
the enhanced structure to attenuate the xray beam. ty of the enhanced
B. Iodinated contrast material decreases the average structure to at-
photon energy of the xray beam; therefore more pho- tenuate the xray
tons are absorbed by the patient. beam.
C. The administration of contrast material results in
a smaller pixel, thereby increasing spatial resolution,
which results in an enhanced image.
D.
9. The xray beam sources for CT produce xray energy D. The beam
that is polychromatic. This means: comprises pho-
A. When viewed by the naked eye, the beam exhibits tons with varying
many different colors. energies.
B. It produce, as a byproduct, a substance known as
polychlorinated biphenyl.
, CT TEST REVIEW (TEST Q'S AND A'S FOR CT REGISTRY PREP. THIS
IS FROM THE BOOK "COMPUTED TOMOGRAPHY FOR TECHNOLOGIS
EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUW
LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RAT
100% C
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C. Photons contained in the beam are all of the same
wavelength.
D. The beam comprises photons with varying ener-
gies.
10. An object that appears on the image but is not present A. Artifact
in the object scanned is called a/n:
A. Artifact
B. Anomaly
C. Shadow
D. Ghost
11. Which is an advantage of filtering the xray beam? D. Filtering re-
A. Filtering reduces the anode heat load duces the radia-
B. A filtered beam produces images with substantial- tion dose to the
ly less quantum mottle patient
C. Filtering the beam prevents energy from being
converted to heat, therefore 100% of the energy is
converted to xrays.
D. Filtering reduces the radiation dose to the patient.
12. Scan thickness is primarily important for the part it D. Volume averag-
plays in: ing
A. Noise reduction
B. The contrast scale
C. Detector aperture opening
D. Volume averaging
13. You are working with the radiologist to establish ex- A. Because the
amination protocols for your department. Which of auditory ossicles
the following is a logical consideration when deter- are quite small, a
mining an appropriate slice thickness for studies of thin slice will be
the internal auditory canal? necessary to re-
A. Because the auditory ossicles are quite small, a duce the chance
thin slice will be necessary to reduce the chance that that volume aver-
volume averaging will obscure their appearance on aging will obscure
, CT TEST REVIEW (TEST Q'S AND A'S FOR CT REGISTRY PREP. THIS
IS FROM THE BOOK "COMPUTED TOMOGRAPHY FOR TECHNOLOGIS
EXAM REVIEW" BY LOIS E ROMANS. PUBLISHED BY WOLTERS KLUW
LIPPINCOTT WILLIAMS AND WILKINS.) QUESTIONS & ANSWERS RAT
100% C
fg0fol
the image. their appearance
B. The appropriate slice thickness will vary consider- on the image.
ably from patient to patient. Therefore, each technol-
ogist should be free to adjust the slice thickness as
he or she deems necessary for the particular patient.
C. A slice thickness of 5 to 7mm is adequate be-
cause the structures of interest are not particularly
small and the examination is most often ordered as a
screening study for asymptomatic patients.
D. The thickest slice available should be used to re-
duce the radiation dose to the corneas.
14. How many CT numbers are assigned to each pixel in B. One
the image matrix?
A. One half the number of all values recorded from the
detector array
B. One
C. The number of HU per pixel is one tenth the display
field of view
D. Two values for a 256 matrix; 4 values for a 512
matrix
15. Which is another name for raw data? B. Scan data
A. Image data
B. Scan data
C. Reconstructed data
D. Displayed data
16. When in the anatomic position, the arms are: C. down by the
A. raised above the head, palms backwards sides, palms for-
B. crossed over the chest, palms on opposite shoul- ward
ders
C. down by the sides, palms forward
D. by the sides, elbows bent, palms backward and
resting on hips
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