CT MOCK EXAM Questions With Complete Verified Solutions.
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Course
CT 109890
Institution
CT 109890
The multiple-scan average dose (MSAD) is used to describe the:
a. dose received in a single CT section
b. amount of radiation absorbed in a quantity of air
c. average dose to a single section within a scan of multiple sections
d. cumulative dose for an entire helical scan - Answer c. avera...
CT MOCK EXAM Questions With
Complete Verified Solutions.
The multiple-scan average dose (MSAD) is used to describe the:
a. dose received in a single CT section
b. amount of radiation absorbed in a quantity of air
c. average dose to a single section within a scan of multiple sections
d. cumulative dose for an entire helical scan - Answer c. average dose to a single section within a scan
of multiple sections
The number of electrons that flow from the cathode to the anode in the tube is controlled by the:
a. mA
b. anode target
c. collimation
d. kV - Answer a. mA
Which of the following has the highest patient dose assuming all other parameters are the same?
a. mA=150, rotation time=3 seconds
b. mA=400, rotation time=1 second
c. mA=200, rotation time=2 seconds
d. mA=200, rotation time=1 second - Answer a. mA=150, rotation time=3 seconds
Which of the following may result from exposing embryo to x-ray radiation?
a. deformities
b. miscarriage
,c. mental retardation
d. All of the above - Answer d. All of the above
On a multi-row detector scanner, a radiation penumbra may be found:
a. on evry other slice
b. on every slice
c. only on the trailing edges of the slices
d. only on the first and last slices of the slice volume - Answer d. only on the first and last slices of the
slice volume
Increasing _________ results in lowering the patient dose.
a. pitch
b. table increment
c. mAs - Answer a. pitch
b. table increment
A 25 year old female is scheduled for a CT scan of the sinuses. She is not absolutely certain that she is
not pregnant and it has been three weeks since her last menstrual period. Which of the following is the
best course of action?
a. perform the exam immediately, while she is experiencing sinus problems
b. postpone the procedure until she is more certain of her condition
c. cancel the procedure indefinitely
d. suggest she get an MRI instead - Answer b. postpone the procedure until she is more certain of her
condition
Which of the following units is used to quantify effective dose?
,a. roentgens (R)
b. grays (Gy)
c. sieverts (Sv)
d. curies (Ci) - Answer c. sieverts (Sv)
Which of the following could be the dose experienced by the pituitary from a typical CT brain scan?
a. 5 mGy
b. 9 rads
c. 2 rads
d. 1 mGy - Answer c. 2 rads
Which of the following is a possible long-term effect of repeated exposure to radiation?
a. cataracts
b. cancer
c. decrease in life expectancy
d. all of the above - Answer d. all of the above
Which of the following does NOT minimize the radiation dose to the patient?
a. decreasing the distance from the x-ray tube to the patient
b. filtration of the low energy photons from the x-ray beam
c. increasing the pitch
d. pre-patient collimation - Answer a. decreasing the distance from the x-ray tube to the patient
On a single-row detector scanner, which of the following does NOT decrease the patient dose?
a. decreasing the scan time while leaving the MA constant
, b. reformat the datta instead of re-scanning
c. increasing the pitch
d. decreasing the slice thickness while covering the same anatomical - Answer d. decreasing the slice
thickness while covering the same anatomical
If there is no overlap or gap between adjacent slices of a CT scan, CTDI __________ MSAD.
a. equals
b. is less than
c. is slightly greater than
d. is much greater than - Answer a. equals
Which of the following is TRUE regarding a radiation penumbra?
a. it occurs because the collimator is broken
b. it is accounted for in the calculation of the MSAD
c. it is radiation that extends outside of the imaging region - Answer b. it is accounted for in the
calculation of the MSAD
c. it is radiation that extends outside of the imaging region
To modify a standard CT protocol so that it is appropriate for children, which of the following should be
decreased?
a. pitch
b. kVp
c. mAs - Answer b. kVp
c. mAs
Which of the following reduces patient dose at the expense of increasing the apparent noise in the
image?
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