COMPUTED TOMOGRAPHY REGISTRY
PREP - FINAL W/CHOL KIM QUESTIONS
AND ANSWERS WITH SOLUTIONS 2024
The technique that allows the user to select the range of pixel values used in a 3-D reformation is
termed:
a. thresholding
b. windowing
c. retrospective reconstruction
d. targeting - ANSWER a
When the mAs value utilized for a given CT acquisition is doubled, which of the following occurs?
a. image noise increase
b. spatial resolution decreases
c. patient dose increases
d. contrast resolution decreases - ANSWER c
The portion of the nephron responsible for filtration of unwanted materials from the blood plasma is
called the:
a. afferent arteriole
b. proximal tubule
c. efferent arteriole
d. glorerulus - ANSWER d
The ability of the CT system to reduce involuntary motion artifacts and provide CT images free of motion
artifact is determined by which of the following components of image quality?
a. in-plane spatial resolution
b. temporal resolution
c. longitudinal spatial resolution
d. contrast resolution - ANSWER b
The spatial resolution of a CT scanner is usually given in the unit of measure:
a. HU
b. Ip/cm
c. ??
d. Hz - ANSWER b
Which of the following is not a typical matrix size used with a modern CT scanner?
a. 80x80
b. 320x320
c. 512x512
,d. 1024x1024 - ANSWER a
The types of detectors used in CT scanner are:
1. gas ionization
2. stimulable phosphor
3. scintillation
a. 1 only
b. 3 only
c. 1 and 3 only
d. 2 and 3 only - ANSWER d
A CT system measures the average linear attenuation coefficient of a voxel of tissue to be 0.189. The
linear attenuation coefficient of water for teh scanner equals 0.181.
The CT number assigned to the pixel representing this voxel of tissue equals:
a. -956 HU
b. -173 HU
c. +44 HU
d. +1044 HU - ANSWER c
Which of the following technical factor(s) play(s) a role in the production of a isotropic dataset?
1. section width
2. SFOV
3. DFOV
a. 1 only
b. 1 and 2 only
c. 1 and 3 only
d. 2 and 3 only - ANSWER d
An injury to the brain at a location opposite to the site of traumatic impact is referred to as:
a. coup
b. contrecoup
c. subdurald
d. epidural - ANSWER d
The duodenum is suspended from the diaphragm by the:
a. ligamentum teres
b. diapharagmatic crus
c. falciform ligament
d. ligament of Treitz - ANSWER b
The normal range of glomerular filtration rage(GFR) for women is:
, a. 50 + 14 mL/min/m2
b. 60 + 10 mL/min/m2
c. 70 + 14 mL/min/m2
d. 89 + 10 mL/min/m2 - ANSWER b
A stereotactic unit would be used for which of the following specialized CT examination?
a. CT-guided fine-needle aspiration of an abdominal abscess
b. 3-D CT angiogram
c. CT-guided biopsy of the brain
d. dual window scanning - ANSWER c
During prospectively ECG-grated cardiac CTA studies, the scanning acquisition mode may be best
described as:
a. axial step-and-shoot
b. helical volumetric
c. axial cine'
d. multiplanar reconstruction - ANSWER a
Which of the following is used in gas ionization CT detectors?
a. neon
b. xenon
c. helium
d. nitrogen - ANSWER b
The lumens of needles used for the injection of contrast media vary in diameter. The unit used to
describe this diameter is called:
a. length
b. cubic centimeters (CC)
c. gauge
d. psi - ANSWER c
The exaggeration of displayed calcification within the coronary arteries during a cardiac MDCT study is
referred to as:
a. aliasing
b. blooming
c. star artifact
d. penumbra - ANSWER b
Errors during the measurement of transmitted radiation by the detectors can result in a form of noise on
the image referred to as a(n)
a. fluence
PREP - FINAL W/CHOL KIM QUESTIONS
AND ANSWERS WITH SOLUTIONS 2024
The technique that allows the user to select the range of pixel values used in a 3-D reformation is
termed:
a. thresholding
b. windowing
c. retrospective reconstruction
d. targeting - ANSWER a
When the mAs value utilized for a given CT acquisition is doubled, which of the following occurs?
a. image noise increase
b. spatial resolution decreases
c. patient dose increases
d. contrast resolution decreases - ANSWER c
The portion of the nephron responsible for filtration of unwanted materials from the blood plasma is
called the:
a. afferent arteriole
b. proximal tubule
c. efferent arteriole
d. glorerulus - ANSWER d
The ability of the CT system to reduce involuntary motion artifacts and provide CT images free of motion
artifact is determined by which of the following components of image quality?
a. in-plane spatial resolution
b. temporal resolution
c. longitudinal spatial resolution
d. contrast resolution - ANSWER b
The spatial resolution of a CT scanner is usually given in the unit of measure:
a. HU
b. Ip/cm
c. ??
d. Hz - ANSWER b
Which of the following is not a typical matrix size used with a modern CT scanner?
a. 80x80
b. 320x320
c. 512x512
,d. 1024x1024 - ANSWER a
The types of detectors used in CT scanner are:
1. gas ionization
2. stimulable phosphor
3. scintillation
a. 1 only
b. 3 only
c. 1 and 3 only
d. 2 and 3 only - ANSWER d
A CT system measures the average linear attenuation coefficient of a voxel of tissue to be 0.189. The
linear attenuation coefficient of water for teh scanner equals 0.181.
The CT number assigned to the pixel representing this voxel of tissue equals:
a. -956 HU
b. -173 HU
c. +44 HU
d. +1044 HU - ANSWER c
Which of the following technical factor(s) play(s) a role in the production of a isotropic dataset?
1. section width
2. SFOV
3. DFOV
a. 1 only
b. 1 and 2 only
c. 1 and 3 only
d. 2 and 3 only - ANSWER d
An injury to the brain at a location opposite to the site of traumatic impact is referred to as:
a. coup
b. contrecoup
c. subdurald
d. epidural - ANSWER d
The duodenum is suspended from the diaphragm by the:
a. ligamentum teres
b. diapharagmatic crus
c. falciform ligament
d. ligament of Treitz - ANSWER b
The normal range of glomerular filtration rage(GFR) for women is:
, a. 50 + 14 mL/min/m2
b. 60 + 10 mL/min/m2
c. 70 + 14 mL/min/m2
d. 89 + 10 mL/min/m2 - ANSWER b
A stereotactic unit would be used for which of the following specialized CT examination?
a. CT-guided fine-needle aspiration of an abdominal abscess
b. 3-D CT angiogram
c. CT-guided biopsy of the brain
d. dual window scanning - ANSWER c
During prospectively ECG-grated cardiac CTA studies, the scanning acquisition mode may be best
described as:
a. axial step-and-shoot
b. helical volumetric
c. axial cine'
d. multiplanar reconstruction - ANSWER a
Which of the following is used in gas ionization CT detectors?
a. neon
b. xenon
c. helium
d. nitrogen - ANSWER b
The lumens of needles used for the injection of contrast media vary in diameter. The unit used to
describe this diameter is called:
a. length
b. cubic centimeters (CC)
c. gauge
d. psi - ANSWER c
The exaggeration of displayed calcification within the coronary arteries during a cardiac MDCT study is
referred to as:
a. aliasing
b. blooming
c. star artifact
d. penumbra - ANSWER b
Errors during the measurement of transmitted radiation by the detectors can result in a form of noise on
the image referred to as a(n)
a. fluence
