Quiz 4

Modern CT scanners rely on _____ to process acquired data.
microcomputers
minicomputers
mainframe computers
supercomputers

minicomputer

To assure fast scan times and immediate data processing, CT computers depend on:
multitasking.
distributed processing.
multiprocessing.
parallel processing.

parallel processing.

Large array parallel processors are responsible for:
executing several tasks sequentially.
performing numerous tasks simultaneously.
hardening the x-ray beam.
assessing faulty detector arrays.

performing numerous tasks simultaneously

Backprojection is associated with:
helical/spiral scanning.
pitch.
increased image sharpness.
artifacts.

artifacts.

Which of the following processes is associated with reconstructing volumetric acquired data to make the data look like individual slices?
backprojection
linear interpolation
pitch
filtering

linear interpolation

The term "misregistration" refers to:
convolution.
backprojection reconstruction.
incorrect image reconstruction.
noise.

incorrect image reconstruction.

Which of the following terms refers to the automatic removal of artifacts that occur in anatomy of various densities?
filtered backprojection
interleaved sampling
z-axis filtering
backprojection

filtered backprojection

What does longitudinal interpolation with z-axis filtering calculate?
filtered backprojection
scan time
pitch
interslice distance

interslice distance

Filtered backprojection is most closely associated with:
aliasing artifacts.
ring artifacts.
artifact-free images.
misregistration.

artifact-free images.

Interpolation is directly affected by:
A and B are correct.
pitch.
filtered backprojection.
focal spot size.

pitch.

The ability of the CT scanner to calculate image data from multiple, overlapping acquisition data sets is called _____ sampling.
interpretive and interlaced
interpretive, interleaved and interlaced
interpretive and interleaved
interleaved and interlaced

interleaved and interlaced

Image reconstruction occurs only after a scan is completed.
True
False

True

Which of the following terms is most closely associated with image reconstruction immediately following a scan?
multiplanar postprocessing
longitudinal interpolation
filtered backprojection
interleaved sampling

filtered backprojection

One advantage of reformatting is that image detail is increased.
True
False

False

Which of the following is not a postprocessing technique?
volume rendering
image smoothing
longitudinal interpolation
maximum intensity projection (MIP)

longitudinal interpolation

Which of the following techniques requires 100% of the data set for postprocessing?
volume rendering
minimum intensity projection (minIP)
shaded surface rendering
MIP

volume rendering

Which type of postprocessing technique would most likely be used for CT virtual colonography exams?
volume rendering
MIP
minIP
shaded surface rendering

minIP

What is the window level if the CT/Hounsfield range is 200 to 1000?
600
800
500
400

600

Which of the following postprocessing techniques is referred to as 4-D reconstruction?
curved multiplanar reconstruction
volume rendering
shaded surface rendering
edge enhancement

volume rendering

Virtual reality (VR) and volume rendering imaging techniques are identical.
True

False

When manipulating an image using the zoom tool, the resolution:
increases.
stays the same.
decreases.

decreases.

Which of the following image manipulation tools is most useful for viewing 3-D images?
zoom
swivel
scroll
pan

swivel

Which of the following workstation applications would most likely be used by cardiologists?
ejection fraction and calcium scoring
ejection fraction, calcium scoring and stereotaxis
calcium scoring and stereotaxis
ejection fraction and stereotaxis

ejection fraction and calcium scoring

Xenon studies are most closely associated with:
radiation oncology treatment planning.
virtual reality (VR) colonography.
neurology studies.
cardiology studies.

neurology studies

CT fluoroscopy is especially useful for:
biopsies.
vessel tracking.
xenon studies.
VR colonography.

biopsies.