CT REGISTRY REVIEW EXAM
2025 QUESTIONS AND ANSWERS
Tungsten is used as the target material on the tube's anode b/c it has a __ atomic
number and a __ melting point.
a. low, high
b. high, low
c. low, low
d. high, high - ANSWER✔✔-d
_____ scanner design was the first to acquire four slices in a single rotation.
a. second generation
b. third generation
c. multi-row detector
d. continuous rotation - ANSWER✔✔-c
The enormous heat that builds up in the CT tube is caused by the:
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,a. intensity of the x-ray emitted from the tube
b. electron beam between the cathode and the anode in the tube
c. x-ray filter in the tube which absorbs the lower energy photons before they can enter
the patient.
d. collision of the electron beam with the tungsten target on the tube anode. -
ANSWER✔✔-d
The number of electron that flow from the cathode to the anode in the tube is controlled
by the .
a. anode target
b. collimator
c. mA
d. kV - ANSWER✔✔-c
The slip ring on continuous rotation CT scanners:
1. prevents the high voltage cable from winding up
2. allows the exam to commence more rapidly
3. eliminates the need for the reversal of the gantry frame rotation.
a. 1 only
b. 2 only
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,c. 3 only
d. 1, 2 & 3 - ANSWER✔✔-d
Which of the following is NOT a part of the CT tube?
a. tungsten target
b. collimator
c. rotating anode
d. filament - ANSWER✔✔-b
Which of the following are NOT commonly used on today's commercially available CT
scanners?
1. xenon detectors
2. fourth generation scanners
3. continuous rotation
a. 1 only
b. 1 & 2
c. 1, 2 & 3 - ANSWER✔✔-b
Which system components converts the projection attenuation data into the proper
digital form for the array processor?
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, a. detector
b. photodiode
c. analog to digital converter
d. host computer - ANSWER✔✔-c
x-ray photons are produced by a fast moving electron:
1. colliding with an atomic nucleus
2. passing close to an atomic nucleus
3. colliding with an electron within an atom and ejecting it
a. 1 only
b. 2 only
c. 3 only
d. 1, 2 & 3 - ANSWER✔✔-d
Which of the following is TRUE regarding solid state detectors?
1. x-ray photons cause the detectors to generate a flash of light
2. they are the detector type used on most CT scanners today
3. they can be used in both third and fourth generation CT systems.
a. 1 only
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2025 QUESTIONS AND ANSWERS
Tungsten is used as the target material on the tube's anode b/c it has a __ atomic
number and a __ melting point.
a. low, high
b. high, low
c. low, low
d. high, high - ANSWER✔✔-d
_____ scanner design was the first to acquire four slices in a single rotation.
a. second generation
b. third generation
c. multi-row detector
d. continuous rotation - ANSWER✔✔-c
The enormous heat that builds up in the CT tube is caused by the:
COPYRIGHT © 2025 ALL RIGHTS RESERVED
,a. intensity of the x-ray emitted from the tube
b. electron beam between the cathode and the anode in the tube
c. x-ray filter in the tube which absorbs the lower energy photons before they can enter
the patient.
d. collision of the electron beam with the tungsten target on the tube anode. -
ANSWER✔✔-d
The number of electron that flow from the cathode to the anode in the tube is controlled
by the .
a. anode target
b. collimator
c. mA
d. kV - ANSWER✔✔-c
The slip ring on continuous rotation CT scanners:
1. prevents the high voltage cable from winding up
2. allows the exam to commence more rapidly
3. eliminates the need for the reversal of the gantry frame rotation.
a. 1 only
b. 2 only
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,c. 3 only
d. 1, 2 & 3 - ANSWER✔✔-d
Which of the following is NOT a part of the CT tube?
a. tungsten target
b. collimator
c. rotating anode
d. filament - ANSWER✔✔-b
Which of the following are NOT commonly used on today's commercially available CT
scanners?
1. xenon detectors
2. fourth generation scanners
3. continuous rotation
a. 1 only
b. 1 & 2
c. 1, 2 & 3 - ANSWER✔✔-b
Which system components converts the projection attenuation data into the proper
digital form for the array processor?
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, a. detector
b. photodiode
c. analog to digital converter
d. host computer - ANSWER✔✔-c
x-ray photons are produced by a fast moving electron:
1. colliding with an atomic nucleus
2. passing close to an atomic nucleus
3. colliding with an electron within an atom and ejecting it
a. 1 only
b. 2 only
c. 3 only
d. 1, 2 & 3 - ANSWER✔✔-d
Which of the following is TRUE regarding solid state detectors?
1. x-ray photons cause the detectors to generate a flash of light
2. they are the detector type used on most CT scanners today
3. they can be used in both third and fourth generation CT systems.
a. 1 only
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