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CT TEST QUESTIONS WITH VERIFIED ANSWERS
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CT TEST QUESTIONS WITH VERIFIED ANSWERS
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CT TEST QUESTIONS WITH VERIFIEDANSWERS
What is the unit of measurement for current of electrons that flow from the filament to
the anode? - Answer-mA
Which is not a scanning parameter?
Slice thickness
Patient size
Field of view
Reconstruction algorithm - Answer-Patient size
What is the kVp range for routine body CT for adult patients? - Answer-120kvp-140kvp
Is it more common to manipulate the Kvp or the mAs for radiation dose? - Answer-The
mAs
What percent reduction in radiation dose do automatic tube current modulations provide
without degrading image quality? - Answer-15% to 40%
What factors are controlled by the CT tech? - Answer-mA , scan time, slice thickness,
field of view, reconstruction algorithm and kVp
Even when the mAs or kVp setting is too high, a good image still results. What effect is
this? - Answer-The uncoupling effect
How is the tube current predefined? - Answer-By taking an AP and lateral localizer
scans. Some adjust in real time
What is the relationship between slice thickness and table travel per rotation - Answer-
Pitch
The travel distance of the CT scan table per 360° rotation of the x-ray tube, divided by
the x-ray beam collimation width is called ________ - Answer-Pitch
_________ resolution is another term used for detail resolution. - Answer-Spatial
How man degrees is a full scan - Answer-360
How many degrees is a partial scan or half scans - Answer-180 plus the degree of arc
of the fan angle
, What is the typical range of values for scan time for a full rotation of the tube and
detector array within the gantry during helical scanning? - Answer-0.5 to 2 seconds
How many degrees is a overscan? - Answer-400 (full scan plus field of view, usually 40
degrees)
What is not considered a scanning parameter? - Answer-Patient size
Whats the advantage of overscans - Answer-Reduced motion artifacts
Which is not another name for reconstruction algorithm?
convolution filter
FC filter
spatial frequency algorithm
algorithm - Answer-spatial frequency algorithm
Which is not a factor that affects contrast resolution?
Slice thickness
Patient size
Reconstruction algorithm
CTDI phantoms - Answer-CTDI phantoms
What does high Ma achieve, lower or higher scan times? - Answer-Lower scan times
What is an alternate term for image accuracy? - Answer-Image fidelity
What is the ability of the system to differentiate between objects with similar densities. -
Answer-Low contrast resolution
What is the level of detail on the image - Answer-High contrast resolution
The systems ability to resolve as separate forms, small objects that are very close
together. - Answer-spatial resolution
If 20 lines an be seen in a 1cm section in an image of the phantom, the spatial
resolution is reported as what? - Answer-20 lines pairs per centimeter
What is used as a direct method of measuring spatial resolution? - Answer-Lines pair
phantom
What is the number of line pairs visible per unit length - Answer-Spatial frequency
What is a ratio that determines the accuracy of the image compared with the actual
object being scanned. It also indicates image fidelity. - Answer-MTF or Modulation
Transfer Function
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