Computed Tomography for Technologists: Exam
Review Questions with Accurate Answers
. All of the following are reasons for obtaining a history before a CT examination is
performed EXCEPT
a. to verify that the patient has not exceeded the radiation limit.
b. to select the appropriate protocol.
c. to be sure the examination can be performed safely.
d. to aide the radiologist in his or her interpretation of the CT examination.
correct answer a. to verify that the patient has not exceeded the radiation limit.
#106.) Refer to Figure 24-8. Name the structure indicated by arrow #1.
a. Mastoid air cells
b. Incus
c. Stapes
d. Cochlea correct answer b. Incus
#11) In what phase of tissue enhancement is the iodinated contrast in Figure 24-
1? correct answer b. Bolus
#117.) Refer to Figure 24-9. Name the structure indicated by arrow #1.
a. Left atrium
b. Aortic arch
c. Right pulmonary artery
d. Right brachiocephalic vein correct answer c. Right pulmonary artery
,#131.) Which is a true statement regarding Figure 24-11?
a. The gallbladder is absent.
b. The spleen is absent.
c. The patient has breast implants.
d. The patient had a Whipple procedure. correct answer b. The spleen is absent.
#67.) What type of 3D display is depicted in Figure 24-2? correct answer c. MIP
#77.) What postprocessing technique created the image of the heart in Figure 24-
3? correct answer c. Volume rendering
#78.) The phantom in Figure 24-4 features a series of cylinders with different
diameters, all at 0.6% (6 HU) difference from the background material. This
phantom is used to measure correct answer b. low-contrast resolution.
#80.) What is the likely cause of the artifact in Figure 24-5? correct answer b.
Patient arms in the SFOV
#85.) What plane is the MPR depicted by Figure 24-6? correct answer b. Coronal
#95.) Refer to Figure 24-7. Name the structure indicated by arrow #1.
a. Corpus callosum
b. Caudate nucleus
c. Lateral ventricle
d. External capsule correct answer c. Lateral ventricle
,10. Automated injection triggering methods are used to
a. simplify the process of contrast injection, so that assistants can perform the
task and patient throughput can be increased.
b. improve patient safety by reducing contrast extravasations.
c. effectively accommodate for individual differences in circulation time by
adjusting the scan delay.
d. effectively accommodate for individual differences in circulation time by
adjusting the contrast flow rate. correct answer c. effectively accommodate for
individual differences in circulation time by adjusting the scan delay.
150. Refer to Figure 24-14. Name the structure indicated by arrow #1.
a. Sternocleidomastoid muscle
b. Scalenus muscle
c. Thyroid gland
d. Cricoid cartilage correct answer c. Thyroid gland
3D printing in CT uses what type of data sets?
a. MPR
b. Localizer image
c. Volume rendered
d. Surface rendered correct answer c. Volume rendered
A bolus injection of 125 mL of an iodinated contrast media with a concentration
of 320 mg of iodine/mL is administered to a 150-pound patient, but because of an
unexpected equipment malfunction, scan data could not be acquired. The
decision must be made as to whether the patient should be moved to a
functioning scanner within the department and the contrast injection repeated.
, What information will be particularly important for the radiologist making the
decision?
a. The amount of radiation the patient received from the failed attempt
b. The patient's history of allergy to any food or medication
c. Evidence of renal impairment or dehydration
d. The brand of the contrast media being used correct answer c. Evidence of renal
impairment or dehydration
A circular ROI is defined and placed on the image, and the resultant measurement
is 3 HU. The standard deviation is 0. It can be surmised that
a. all of the pixels within the region have identical values.
b. the area measured is composed of a variety of very different tissue types.
c. the area is likely a calcified nodule.
d. the patient is obese. correct answer a. all of the pixels within the region have
identical values.
A CT of the abdomen and pelvis is ordered for a child weighing 18 kg. Using the
standard pediatric formula, what dose of iodinated contrast medium is given?
a. 9 mL
b. 18 mL
c. 36 mL
d. 54 mL correct answer c. 36 mL
A CT study done for the screening, detection, or exclusion of pulmonary nodules
or infiltrates are typically done
Review Questions with Accurate Answers
. All of the following are reasons for obtaining a history before a CT examination is
performed EXCEPT
a. to verify that the patient has not exceeded the radiation limit.
b. to select the appropriate protocol.
c. to be sure the examination can be performed safely.
d. to aide the radiologist in his or her interpretation of the CT examination.
correct answer a. to verify that the patient has not exceeded the radiation limit.
#106.) Refer to Figure 24-8. Name the structure indicated by arrow #1.
a. Mastoid air cells
b. Incus
c. Stapes
d. Cochlea correct answer b. Incus
#11) In what phase of tissue enhancement is the iodinated contrast in Figure 24-
1? correct answer b. Bolus
#117.) Refer to Figure 24-9. Name the structure indicated by arrow #1.
a. Left atrium
b. Aortic arch
c. Right pulmonary artery
d. Right brachiocephalic vein correct answer c. Right pulmonary artery
,#131.) Which is a true statement regarding Figure 24-11?
a. The gallbladder is absent.
b. The spleen is absent.
c. The patient has breast implants.
d. The patient had a Whipple procedure. correct answer b. The spleen is absent.
#67.) What type of 3D display is depicted in Figure 24-2? correct answer c. MIP
#77.) What postprocessing technique created the image of the heart in Figure 24-
3? correct answer c. Volume rendering
#78.) The phantom in Figure 24-4 features a series of cylinders with different
diameters, all at 0.6% (6 HU) difference from the background material. This
phantom is used to measure correct answer b. low-contrast resolution.
#80.) What is the likely cause of the artifact in Figure 24-5? correct answer b.
Patient arms in the SFOV
#85.) What plane is the MPR depicted by Figure 24-6? correct answer b. Coronal
#95.) Refer to Figure 24-7. Name the structure indicated by arrow #1.
a. Corpus callosum
b. Caudate nucleus
c. Lateral ventricle
d. External capsule correct answer c. Lateral ventricle
,10. Automated injection triggering methods are used to
a. simplify the process of contrast injection, so that assistants can perform the
task and patient throughput can be increased.
b. improve patient safety by reducing contrast extravasations.
c. effectively accommodate for individual differences in circulation time by
adjusting the scan delay.
d. effectively accommodate for individual differences in circulation time by
adjusting the contrast flow rate. correct answer c. effectively accommodate for
individual differences in circulation time by adjusting the scan delay.
150. Refer to Figure 24-14. Name the structure indicated by arrow #1.
a. Sternocleidomastoid muscle
b. Scalenus muscle
c. Thyroid gland
d. Cricoid cartilage correct answer c. Thyroid gland
3D printing in CT uses what type of data sets?
a. MPR
b. Localizer image
c. Volume rendered
d. Surface rendered correct answer c. Volume rendered
A bolus injection of 125 mL of an iodinated contrast media with a concentration
of 320 mg of iodine/mL is administered to a 150-pound patient, but because of an
unexpected equipment malfunction, scan data could not be acquired. The
decision must be made as to whether the patient should be moved to a
functioning scanner within the department and the contrast injection repeated.
, What information will be particularly important for the radiologist making the
decision?
a. The amount of radiation the patient received from the failed attempt
b. The patient's history of allergy to any food or medication
c. Evidence of renal impairment or dehydration
d. The brand of the contrast media being used correct answer c. Evidence of renal
impairment or dehydration
A circular ROI is defined and placed on the image, and the resultant measurement
is 3 HU. The standard deviation is 0. It can be surmised that
a. all of the pixels within the region have identical values.
b. the area measured is composed of a variety of very different tissue types.
c. the area is likely a calcified nodule.
d. the patient is obese. correct answer a. all of the pixels within the region have
identical values.
A CT of the abdomen and pelvis is ordered for a child weighing 18 kg. Using the
standard pediatric formula, what dose of iodinated contrast medium is given?
a. 9 mL
b. 18 mL
c. 36 mL
d. 54 mL correct answer c. 36 mL
A CT study done for the screening, detection, or exclusion of pulmonary nodules
or infiltrates are typically done
