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CT Image Production CT Bootcamp with actual answers graded A+
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CT Image Production CT Bootcamp
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CT Image Production CT BootcampWhich of the following terms refers to the number of x-ray photons produced in the x-ray beam?
• Energy
• Hardness
• Penetrability
• Intensity - correct answer ✔✔• Intensity
Intensity refers to the number of x-ray photons produced in the beam. It is also called x-ray quantity.
What is the primary advantage of computed tomography (CT) imaging in the diagnosis of a ruptured
aortic aneurysm?
A. CT imaging allows for diagnosis without invasive surgeries
B. CT imaging allows for diagnosis at a reduced radiation dose
C. CT imaging allows for diagnosis and treatment within the same procedure
D. CT imaging allows for diagnosis without the use of iodinated contrast - correct answer ✔✔A. CT
imaging allows for diagnosis without invasive surgeries
The primary advantage of computed tomography (CT) imaging in the diagnosis of a ruptured aortic
aneurysm is the ability to diagnose the condition without invasive surgeries.
The milliampere-seconds (mAs) used for a computed tomography (CT) procedure is the product of the
milliamperage (mA) and what other exposure factor?
• Kilovoltage peak (KVp)
• Rotation time
• Beam width
,• Table speed - correct answer ✔✔• Rotation time
The milliampere-seconds (mAs) used for a computed tomography (CT) procedure is the product of the
milliamperage (mA) and rotation time in seconds (s). The mA and rotation time (s) are multiplied
together to calculate the total mAs.
What is the basis of image production in both radiographic imaging and computed tomography (CT)
imaging?
• Both depend on injected contrast agents
• Both produce three-dimensional images
• Both detect and display tissues based on density
• Both produce multiple imaging planes - correct answer ✔✔• Both detect and display tissues based on
density
Image production in both radiography and computed tomography (CT) is based on the detection and
display of tissues based on their density. The x-ray beam is projected at the patient and attenuated to
different degrees by the different tissues within the patient. The degree of attenuation is defined by the
tissue density. The remnant beam is then collected by the detectors and processed into an image.
Which two of the following were significant limitations of early computed tomography (CT) scanners?
(Select two)
• Early CT scanners required several hours for image production
• Early CT scanners were not compatible with magnetic implants
• Early CT scanners were used only helical scanning mode
• Early CT scanners required iodinated contrast
• Early CT scanners were only large enough to scan the head - correct answer ✔✔• Early CT scanners
required several hours for image production
• Early CT scanners were only large enough to scan the head
,Early computed tomography (CT) scanners required several hours for image production, and they were
only large enough to scan the head.
Contrast-enhanced imaging is significant in computed tomography (CT) scanning because it:
• Decreases radiation dose to the patient
• Enables differentiation between similar-density tissues
• Reduces the need for multiple imaging planes
• Speeds up the scanning process - correct answer ✔✔• Enables differentiation between similar-density
tissues
Contrast-enhanced imaging is significant in computed tomography (CT) as it makes certain internal
structures, which might have similar density and be indistinguishable, stand out from the surrounding
tissues by varying their density.
What exposure factor should be adjusted to increase the proportion of x-ray beam penetration through
the patient during a computed tomography (CT) procedure?
• Decrease beam width
• Decrease rotation time
• Increase milliamperage (mA)
• Increase kilovoltage peak (KVp) - correct answer ✔✔• Increase kilovoltage peak (KVp)
Increasing the proportion of x-ray beam penetration can be accomplished by increasing the kilovoltage
peak (kVp) setting. The kVp is the only exposure factor that can be modified by the technologist that has
a direct influence on the energy and penetrating ability of the x-ray beam.
When KVp is increased, a higher proportion of photons will penetrate through the patient to expose the
detector array.
What is the advantage of producing three dimensions of image data in computed tomography (CT)?
• Patient anatomy can be viewed in slices without superimposition
, • Patient anatomy can be viewed with decreased radiation exposure
• Three-dimensional image data generates higher contrast resolution
• Three-dimensional image data generates higher spatial resolution - correct answer ✔✔• Patient
anatomy can be viewed in slices without superimposition
The advantage of producing three dimensions of image data in computed tomography (CT) is the ability
to view patient anatomy in slices without superimposition. This is one of the most significant advantages
of CT Imaging over radiographic imaging.
Which computed tomography (CT) examination is most commonly ordered, representing nearly 25% of
all CT scans at most institutions?
• CT chest with contrast
• CT angiography of the chest
• CT abdomen and pelvis with contrast
• CT head without contrast - correct answer ✔✔• CT head without contrast
Computed tomography (CT) of the head without contrast is the most common CT examination,
representing nearly 25% of all CT scans performed at many institutions.
The following image represents the prescribed tube current for a computed tomography (CT) procedure,
overlying the lateral localizer image. Based on this graphic, what is the maximum tube current to be used
during the scan?
Tube Current (mA)
500
450
400
350
300
250
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