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Computed Tomography Ch 1-4 Quiz and answers respectively.
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Computed Tomography Ch 1-4 Quiz and answers respectively.
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CT Image Production questions reviewwith correct answers.
Which two of the following were significant limitations of early computed tomography (CT) scanners?
(Select two) ANS - - early CT scanners required several hours for image production
- early CT scanners were only large enough to scan the head
What is the advantage of producing three dimensions of image data in CT? ANS - patient anatomy can
be viewed in slices without superimposition
Contrast-enhanced imaging is significant in CT scanning because it: ANS - enables differentiation
between similar-density tissues
What is the basis of image production in both radiographic imaging and CT imaging? ANS - both detect
and display tissues based on density
Which CT examination is most commonly ordered, representing nearly 25% of all CT scans at most
institutions? ANS - CT head without contrast
What is the primary advantage of CT imaging in the diagnosis of a ruptured aortic aneurysm? ANS - CT
imaging allows for diagnosis without invasive surgeries
What characteristic of CT imaging allows for the reformation of images into axial, sagittal, and coronal
planes? ANS - collection of a three-dimensional data set
What is the primary purpose of administering iodinated contrast for CT imaging? ANS - increased tissue
differentiation
Which of the following images represents a coronal plane of the brain? ANS - image (B)
,What imaging factor has improved the visibility of the Wilms tumor in image (B)? ANS - use of
intravenous (IV) contrast media
The cathode filament inside the x-ray tube primarily serves as the: ANS - source of electrons
What is the primary purpose of the anode inside the x-ray tube? ANS - serve as the target of the
electron stream
Which of the following terms refers to the number of x-ray photons produced in the x-ray beam? ANS -
intensity
When the milliamperage (mA) is increased, the x-ray beam intensity will: ANS - increase
How is the x-ray beam intensity influenced by an increase in the rotation time used for a CT procedure?
ANS - increased x-ray beam intensity
The milliampere-seconds (mA) used for a CT procedure is the product of the milliamperage (mA) and
what other exposure factor? ANS - rotation time
If rotation time is reduced by half, what adjustment should be made to the milliamperage (mA) to retain
the same photon intensity? ANS - mA should be doubled
How does an increase in the kilovoltage peak (kVp) setting influence the x-ray beam intensity? ANS -
intensity increases
What exposure factor should be adjusted to increase the proportion of x-ray beam penetration through
the patient during a CT procedure? ANS - increase kVp
The following image represents the prescribed tube current for a CT procedure, overlying the lateral
localizer image. Based on this graphic, what is the maximum tube current to be used during the scan?
ANS - 450 milliamperes (mA)
, The milliampere-seconds (mAs) used for a CT procedure is the product of the milliamperage (mA) and
what other exposure factor? ANS - rotation time
What is the primary difference between CT data acquisition and general radiography acquisition? ANS -
CT images are created from hundreds of projections around the patient
How are the basic steps of image production in CT similar to that of digital radiography? ANS - both CT
and radiography create images based on x-ray attenuation
What portion of the CT scanner system houses the x-ray tube? ANS - gantry
How much time is required by modern CT scanners for the processing of individual x-ray projections into
a CT image? ANS - a few milliseconds
Which of the following components in the CT scanner is responsible for shaping the dimensions of the
incident x-ray beam? ANS - collimators
Which system in the CT scanner is responsible for the physical support of critical components like the x-
ray tube and detectors? ANS - scanner gantry
What is the primary advantage of a 32-slice CT scanner compared to a 16-slice CT scanner? ANS -
decreased data acquisition time
What portion of the following CT scanner gantry represents the detector array? ANS - component (A)
What portion of the following CT scanner system houses the host computer and array processor? ANS -
component (D)
What is the role of the detectors in the CT scanner? ANS - collecting the remnant x-ray beam
Which of the following devices is responsible for capturing radiation and producing an electrical signal in
a CT scanner? ANS - detectors
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