CT quiz 3 || 100% Errorless Answers.
The ability to differentiate slight differences in density on an image" is the definition of:
a. Contrast
b. Dose
c. Resolution
d. Noise correct answers Contrast
Which of the following would improve spatial resolution?
a. Decrease the kVp
b. Decrease the reconstruction field-of-view
c. Increase the mAs
d. Increase the slice thickness correct answers Decrease the reconstruction field-of-view
Noise is more apparent in an image when:
a. Using a high mAs
b. A smooth reconstruction filter is used
c. There is an insufficient number of photons to make the image
d. The slice thickness is greater correct answers There is an insufficient number of photons to
make the image
Which of the following affects patient dose?
1. Rotation Time
2. Anatomical Coverage
3. Pitch
a. 1, 2, & 3
b. 1 & 3
c. 2 & 3
d. 1 & 2 correct answers 1, 2, & 3
Which of the following statements is TRUE?
1. CT scanners usually have saved protocols for various types of clinical studies
2. Varying a single CT scan parameter can simultaneously affect the ability to visualize small
structures on the image and how grainy the image appears
3. A new value for every CT imaging parameter must be entered prior to each scan
a. 1 only
b. 2 only
c. 1 & 2
d. 2 & 3 correct answers 1 & 2
, If all other factors are held constant, a scan using ______ mAs will produce an image with the
least amount of apparent noise.
a. 200
b. 300
c. 250
d. 100 correct answers 300
Which of the following will yield the lowest patient dose (assuming all other parameters are the
same)?
a. mA= 200, 1 sec. rotation
b. mA= 100, 0.5 sec. rotation
c. mA= 200, 0.5 sec. rotation
d. mA= 100, 1 sec. rotation correct answers mA= 100, 0.5 sec. rotation
Which of the following could be used to compensate for the increased image noise which results
when a reduced reconstruction FOV is used?
1. Increased mAs
2. Increased slice thickness
3. Decreased matrix
a. 2 & 3
b. 1, 2 & 3
c. 1 & 2
d. 1 & 3 correct answers 1, 2 & 3
If a thin slice is used, which of the following would help reduce the image noise?
a. Increased mAs
b. Decreased kV
c. Increased matrix
d. Reduced reconstruction field-of-view correct answers Increased mAs
Which of the following CT scan parameters affects the contrast of the image?
a. kVp
b. reconstruction field-of-View
c. mAs
d. slice thickness correct answers kVp
To convert an abdominal protocol for adults to an abdominal protocol for pediatric patients, the
kVp should be ________________ to achieve optimal tissue contrast.
The ability to differentiate slight differences in density on an image" is the definition of:
a. Contrast
b. Dose
c. Resolution
d. Noise correct answers Contrast
Which of the following would improve spatial resolution?
a. Decrease the kVp
b. Decrease the reconstruction field-of-view
c. Increase the mAs
d. Increase the slice thickness correct answers Decrease the reconstruction field-of-view
Noise is more apparent in an image when:
a. Using a high mAs
b. A smooth reconstruction filter is used
c. There is an insufficient number of photons to make the image
d. The slice thickness is greater correct answers There is an insufficient number of photons to
make the image
Which of the following affects patient dose?
1. Rotation Time
2. Anatomical Coverage
3. Pitch
a. 1, 2, & 3
b. 1 & 3
c. 2 & 3
d. 1 & 2 correct answers 1, 2, & 3
Which of the following statements is TRUE?
1. CT scanners usually have saved protocols for various types of clinical studies
2. Varying a single CT scan parameter can simultaneously affect the ability to visualize small
structures on the image and how grainy the image appears
3. A new value for every CT imaging parameter must be entered prior to each scan
a. 1 only
b. 2 only
c. 1 & 2
d. 2 & 3 correct answers 1 & 2
, If all other factors are held constant, a scan using ______ mAs will produce an image with the
least amount of apparent noise.
a. 200
b. 300
c. 250
d. 100 correct answers 300
Which of the following will yield the lowest patient dose (assuming all other parameters are the
same)?
a. mA= 200, 1 sec. rotation
b. mA= 100, 0.5 sec. rotation
c. mA= 200, 0.5 sec. rotation
d. mA= 100, 1 sec. rotation correct answers mA= 100, 0.5 sec. rotation
Which of the following could be used to compensate for the increased image noise which results
when a reduced reconstruction FOV is used?
1. Increased mAs
2. Increased slice thickness
3. Decreased matrix
a. 2 & 3
b. 1, 2 & 3
c. 1 & 2
d. 1 & 3 correct answers 1, 2 & 3
If a thin slice is used, which of the following would help reduce the image noise?
a. Increased mAs
b. Decreased kV
c. Increased matrix
d. Reduced reconstruction field-of-view correct answers Increased mAs
Which of the following CT scan parameters affects the contrast of the image?
a. kVp
b. reconstruction field-of-View
c. mAs
d. slice thickness correct answers kVp
To convert an abdominal protocol for adults to an abdominal protocol for pediatric patients, the
kVp should be ________________ to achieve optimal tissue contrast.
