CT Image Production
Which two of the following were significant limitations of early computed tomography (CT) scanners?
(Select two) - correct answer ✔✔- 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? - correct answer ✔✔patient
anatomy can be viewed in slices without superimposition
Contrast-enhanced imaging is significant in CT scanning because it: - correct answer ✔✔enables
differentiation between similar-density tissues
What is the basis of image production in both radiographic imaging and CT imaging? - correct answer
✔✔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? - correct answer ✔✔CT head without contrast
What is the primary advantage of CT imaging in the diagnosis of a ruptured aortic aneurysm? - correct
answer ✔✔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? - correct answer ✔✔collection of a three-dimensional data set
What is the primary purpose of administering iodinated contrast for CT imaging? - correct answer
✔✔increased tissue differentiation
Which of the following images represents a coronal plane of the brain? - correct answer ✔✔image (B)
What imaging factor has improved the visibility of the Wilms tumor in image (B)? - correct answer
✔✔use of intravenous (IV) contrast media
,The cathode filament inside the x-ray tube primarily serves as the: - correct answer ✔✔source of
electrons
What is the primary purpose of the anode inside the x-ray tube? - correct answer ✔✔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? -
correct answer ✔✔intensity
When the milliamperage (mA) is increased, the x-ray beam intensity will: - correct answer ✔✔increase
How is the x-ray beam intensity influenced by an increase in the rotation time used for a CT procedure? -
correct answer ✔✔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? - correct answer ✔✔rotation time
If rotation time is reduced by half, what adjustment should be made to the milliamperage (mA) to retain
the same photon intensity? - correct answer ✔✔mA should be doubled
How does an increase in the kilovoltage peak (kVp) setting influence the x-ray beam intensity? - correct
answer ✔✔intensity increases
What exposure factor should be adjusted to increase the proportion of x-ray beam penetration through
the patient during a CT procedure? - correct answer ✔✔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? -
correct answer ✔✔450 milliamperes (mA)
The milliampere-seconds (mAs) used for a CT procedure is the product of the milliamperage (mA) and
what other exposure factor? - correct answer ✔✔rotation time
, What is the primary difference between CT data acquisition and general radiography acquisition? -
correct answer ✔✔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? - correct answer
✔✔both CT and radiography create images based on x-ray attenuation
What portion of the CT scanner system houses the x-ray tube? - correct answer ✔✔gantry
How much time is required by modern CT scanners for the processing of individual x-ray projections into
a CT image? - correct answer ✔✔a few milliseconds
Which of the following components in the CT scanner is responsible for shaping the dimensions of the
incident x-ray beam? - correct answer ✔✔collimators
Which system in the CT scanner is responsible for the physical support of critical components like the x-
ray tube and detectors? - correct answer ✔✔scanner gantry
What is the primary advantage of a 32-slice CT scanner compared to a 16-slice CT scanner? - correct
answer ✔✔decreased data acquisition time
What portion of the following CT scanner gantry represents the detector array? - correct answer
✔✔component (A)
What portion of the following CT scanner system houses the host computer and array processor? -
correct answer ✔✔component (D)
What is the role of the detectors in the CT scanner? - correct answer ✔✔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? - correct answer ✔✔detectors
Which two of the following were significant limitations of early computed tomography (CT) scanners?
(Select two) - correct answer ✔✔- 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? - correct answer ✔✔patient
anatomy can be viewed in slices without superimposition
Contrast-enhanced imaging is significant in CT scanning because it: - correct answer ✔✔enables
differentiation between similar-density tissues
What is the basis of image production in both radiographic imaging and CT imaging? - correct answer
✔✔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? - correct answer ✔✔CT head without contrast
What is the primary advantage of CT imaging in the diagnosis of a ruptured aortic aneurysm? - correct
answer ✔✔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? - correct answer ✔✔collection of a three-dimensional data set
What is the primary purpose of administering iodinated contrast for CT imaging? - correct answer
✔✔increased tissue differentiation
Which of the following images represents a coronal plane of the brain? - correct answer ✔✔image (B)
What imaging factor has improved the visibility of the Wilms tumor in image (B)? - correct answer
✔✔use of intravenous (IV) contrast media
,The cathode filament inside the x-ray tube primarily serves as the: - correct answer ✔✔source of
electrons
What is the primary purpose of the anode inside the x-ray tube? - correct answer ✔✔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? -
correct answer ✔✔intensity
When the milliamperage (mA) is increased, the x-ray beam intensity will: - correct answer ✔✔increase
How is the x-ray beam intensity influenced by an increase in the rotation time used for a CT procedure? -
correct answer ✔✔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? - correct answer ✔✔rotation time
If rotation time is reduced by half, what adjustment should be made to the milliamperage (mA) to retain
the same photon intensity? - correct answer ✔✔mA should be doubled
How does an increase in the kilovoltage peak (kVp) setting influence the x-ray beam intensity? - correct
answer ✔✔intensity increases
What exposure factor should be adjusted to increase the proportion of x-ray beam penetration through
the patient during a CT procedure? - correct answer ✔✔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? -
correct answer ✔✔450 milliamperes (mA)
The milliampere-seconds (mAs) used for a CT procedure is the product of the milliamperage (mA) and
what other exposure factor? - correct answer ✔✔rotation time
, What is the primary difference between CT data acquisition and general radiography acquisition? -
correct answer ✔✔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? - correct answer
✔✔both CT and radiography create images based on x-ray attenuation
What portion of the CT scanner system houses the x-ray tube? - correct answer ✔✔gantry
How much time is required by modern CT scanners for the processing of individual x-ray projections into
a CT image? - correct answer ✔✔a few milliseconds
Which of the following components in the CT scanner is responsible for shaping the dimensions of the
incident x-ray beam? - correct answer ✔✔collimators
Which system in the CT scanner is responsible for the physical support of critical components like the x-
ray tube and detectors? - correct answer ✔✔scanner gantry
What is the primary advantage of a 32-slice CT scanner compared to a 16-slice CT scanner? - correct
answer ✔✔decreased data acquisition time
What portion of the following CT scanner gantry represents the detector array? - correct answer
✔✔component (A)
What portion of the following CT scanner system houses the host computer and array processor? -
correct answer ✔✔component (D)
What is the role of the detectors in the CT scanner? - correct answer ✔✔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? - correct answer ✔✔detectors
