CT Registry Review Questions with 100%
Verified Correct Answers
1. Which of the following statements is false?
a. The elimination of superimposed structures is a distinct advantage of CT over plain film
imaging.
b. CT images possess superior quality.
c. Contrast resolution is approximately 10x better with CT compared to plain film imaging.
d. Spatial resolution is approximately 10x better with CT compared to plain film imaging. - Correct
Answer d
2. Which type of beam coverage will result in the greatest production of scatter radiation?
a. Fan beam
b. Pencil beam
c. Area beam
d. Cone beam - Correct Answer d
Which type of beam coverage is typical of SDCT systems?
a. Fan beam
b. Pencil beam
c. Area beam
d. Cone beam - Correct Answer a
Which type of beam coverage is typical of MDCT systems?
a. Fan beam
,b. Pencil beam
c. Area beam
d. Cone beam - Correct Answer d
"Translate-Rotate" is in reference to which of the following generations of CT geometries?
i. First
ii. Second
iii. Third
iv. Fourth
a. 1 thru 4
b. 1&2only
c. 3 only
d. 4 only - Correct Answer b
Which of the following structures possesses the ability to attenuate radiation the greatest?
a. Air
b. Muscle
c. Bone
d. Soft tissue - Correct Answer c
Which of the following structures is represented by the highest Hounsfield Unit?
a. Air
b. Muscle
c. Bone
d. Soft tissue - Correct Answer c
Which of the following HU values would be typical of a metallic pacemaker?
,a. 2000
b. 1000
c. -500
d. -2500 - Correct Answer a
The process in CT by which different tissue attenuation values are averaged to produce one less
accurate pixel reading is most likely defined as which of the following?
a. Interpolation
b. Extrapolation
c. Volume averaging
d. Beam hardening - Correct Answer c
Which of the following pieces of CT hardware is principally responsible for determining slice
thickness when the system is SDCT?
a. Pre-detector collimator
b. Pre-patient collimator
c. The cone beam collimator
d. The fan beam collimator - Correct Answer b
From the choices below, please select the best way to minimize the problem associated with Partial
Volume Averaging.
a. Select an alternative algorithm
b. Increase the slice thickness
c. Decrease the slice thickness
d. Increase procedure mA - Correct Answer c
Segmentation and averaging of the data results in what kind of data?
1. scan data
, 2. Image data
3. Raw data
a. 2 only
b. 3 only
c. 1&3only d. 1&2only - Correct Answer a
As associated with which of the following, does raw data become image data?
a. The detector system
b. The ADC
c. The DAS
d. The voxel - Correct Answer b
Which imaging plane divides the body into equal anterior and posterior portions?
a. the MSP
b. the MCP
c. the Axial
d. the Oblique - Correct Answer b
Which of the following is NOT housed in the gantry?
1. X-ray source
2. Cooling system
3. Generator
4. Slip ring system
5. Collimation system
6. Detector system
a. 3&6only
b. 1, 3 & 6 only
Verified Correct Answers
1. Which of the following statements is false?
a. The elimination of superimposed structures is a distinct advantage of CT over plain film
imaging.
b. CT images possess superior quality.
c. Contrast resolution is approximately 10x better with CT compared to plain film imaging.
d. Spatial resolution is approximately 10x better with CT compared to plain film imaging. - Correct
Answer d
2. Which type of beam coverage will result in the greatest production of scatter radiation?
a. Fan beam
b. Pencil beam
c. Area beam
d. Cone beam - Correct Answer d
Which type of beam coverage is typical of SDCT systems?
a. Fan beam
b. Pencil beam
c. Area beam
d. Cone beam - Correct Answer a
Which type of beam coverage is typical of MDCT systems?
a. Fan beam
,b. Pencil beam
c. Area beam
d. Cone beam - Correct Answer d
"Translate-Rotate" is in reference to which of the following generations of CT geometries?
i. First
ii. Second
iii. Third
iv. Fourth
a. 1 thru 4
b. 1&2only
c. 3 only
d. 4 only - Correct Answer b
Which of the following structures possesses the ability to attenuate radiation the greatest?
a. Air
b. Muscle
c. Bone
d. Soft tissue - Correct Answer c
Which of the following structures is represented by the highest Hounsfield Unit?
a. Air
b. Muscle
c. Bone
d. Soft tissue - Correct Answer c
Which of the following HU values would be typical of a metallic pacemaker?
,a. 2000
b. 1000
c. -500
d. -2500 - Correct Answer a
The process in CT by which different tissue attenuation values are averaged to produce one less
accurate pixel reading is most likely defined as which of the following?
a. Interpolation
b. Extrapolation
c. Volume averaging
d. Beam hardening - Correct Answer c
Which of the following pieces of CT hardware is principally responsible for determining slice
thickness when the system is SDCT?
a. Pre-detector collimator
b. Pre-patient collimator
c. The cone beam collimator
d. The fan beam collimator - Correct Answer b
From the choices below, please select the best way to minimize the problem associated with Partial
Volume Averaging.
a. Select an alternative algorithm
b. Increase the slice thickness
c. Decrease the slice thickness
d. Increase procedure mA - Correct Answer c
Segmentation and averaging of the data results in what kind of data?
1. scan data
, 2. Image data
3. Raw data
a. 2 only
b. 3 only
c. 1&3only d. 1&2only - Correct Answer a
As associated with which of the following, does raw data become image data?
a. The detector system
b. The ADC
c. The DAS
d. The voxel - Correct Answer b
Which imaging plane divides the body into equal anterior and posterior portions?
a. the MSP
b. the MCP
c. the Axial
d. the Oblique - Correct Answer b
Which of the following is NOT housed in the gantry?
1. X-ray source
2. Cooling system
3. Generator
4. Slip ring system
5. Collimation system
6. Detector system
a. 3&6only
b. 1, 3 & 6 only
