1|Page
Mosby CT Registry Review 2025
|Actual Questions With Answers
What is the smallest component of a digital image - correct-answer-pixel
How many CT numbers are assigned to each pixel in the image matrix? - correct-
answer-One
In order to pass ACR CT accreditation, the CT scanner's adult head protocol must
be within - correct-answer-1.0
The QC test for the average CT number for water should be done - correct-
answer-Daily
The following are all basic tenets of a QC program for computed tomography
scanner - correct-answer-*QC test must be conducted regularly
*Accurate record keeping
,2|Page
*all test results must be interpreted promptly
Using the ACR CT accreditation phantom, module 3 is used to measure which of
the following - correct-answer-CT number uniformity
The following QC test should be done on a monthly basis - correct-answer-high
contrast resolution
The CT number at the center of a uniformly filled water phantom should ideally be
- correct-answer-0
The ACR CT accreditation phantom is designed to perform QC measurements of -
correct-answer-*positioning accuracy and light accuracy alignment only
*CT number accuracy and slice thickness only
*low contrast resolution, CT number uniformity, and high contrast resolution
The ACR tolerance limit for the CT number accuracy for water is - correct-answer-
+-7HU or +-5 preferred
,3|Page
The test for the average CT number of water should be tested at - correct-answer-
*acceptance
*daily
The ACR tolerance limit for the CT number uniformity is which of the following -
correct-answer-The center CT number must be between plus or minus 7HU plus
the abdomen protocol must be used
To evaluate low contrast resolution, phantoms are scanned using different ?
settings - correct-answer-mAs
For an increase from 200 mA to 400 mA in a CT exam, the result would be to -
correct-answer-Increase low contrast resolution
This ability is also commonly referred to as the low contrast resolution or the
sensitivity of the CT scanner - correct-answer-contrast resolution
The major advantage of a CT scanner over a screen-film radiography system is -
correct-answer-Better low contrast discrimination
, 4|Page
For CT images, all of the following factors improve the visibility of large, low-
contrast lesions except? - correct-answer-Smaller pixel sizes
As the iodine concentration ? the viscosity of the substance will ? - correct-
answer-increase, increase
A fluid with a high viscosity is relatively - correct-answer-thick and flows slowly
The viscosity of a solution may be changed by regulating - correct-answer-
temperature
A patient with a temperature over ______ is considered to have a fever.
98.6.
96.8.
99.8.
100. - correct-answer-Correct Answer:
99.8
Mosby CT Registry Review 2025
|Actual Questions With Answers
What is the smallest component of a digital image - correct-answer-pixel
How many CT numbers are assigned to each pixel in the image matrix? - correct-
answer-One
In order to pass ACR CT accreditation, the CT scanner's adult head protocol must
be within - correct-answer-1.0
The QC test for the average CT number for water should be done - correct-
answer-Daily
The following are all basic tenets of a QC program for computed tomography
scanner - correct-answer-*QC test must be conducted regularly
*Accurate record keeping
,2|Page
*all test results must be interpreted promptly
Using the ACR CT accreditation phantom, module 3 is used to measure which of
the following - correct-answer-CT number uniformity
The following QC test should be done on a monthly basis - correct-answer-high
contrast resolution
The CT number at the center of a uniformly filled water phantom should ideally be
- correct-answer-0
The ACR CT accreditation phantom is designed to perform QC measurements of -
correct-answer-*positioning accuracy and light accuracy alignment only
*CT number accuracy and slice thickness only
*low contrast resolution, CT number uniformity, and high contrast resolution
The ACR tolerance limit for the CT number accuracy for water is - correct-answer-
+-7HU or +-5 preferred
,3|Page
The test for the average CT number of water should be tested at - correct-answer-
*acceptance
*daily
The ACR tolerance limit for the CT number uniformity is which of the following -
correct-answer-The center CT number must be between plus or minus 7HU plus
the abdomen protocol must be used
To evaluate low contrast resolution, phantoms are scanned using different ?
settings - correct-answer-mAs
For an increase from 200 mA to 400 mA in a CT exam, the result would be to -
correct-answer-Increase low contrast resolution
This ability is also commonly referred to as the low contrast resolution or the
sensitivity of the CT scanner - correct-answer-contrast resolution
The major advantage of a CT scanner over a screen-film radiography system is -
correct-answer-Better low contrast discrimination
, 4|Page
For CT images, all of the following factors improve the visibility of large, low-
contrast lesions except? - correct-answer-Smaller pixel sizes
As the iodine concentration ? the viscosity of the substance will ? - correct-
answer-increase, increase
A fluid with a high viscosity is relatively - correct-answer-thick and flows slowly
The viscosity of a solution may be changed by regulating - correct-answer-
temperature
A patient with a temperature over ______ is considered to have a fever.
98.6.
96.8.
99.8.
100. - correct-answer-Correct Answer:
99.8
