Computed Tomography Physical Principles Clinical Applications and Quality Control 4th Edition Test Bank
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Chapter 04: Data Acquisition Concepts
Seeram: Computed Tomography, 4th Edition
MULTIPLE CHOICE
1.
Which of the following
refers to a method by which the patient is systematically scanned by the X-ray
tube and detectors to collect enough information for image reconstruction?
|
a.
|
Beam geometry
|
|
b.
|
Data acquisition
|
|
c.
|
Sampling
|
|
d.
|
Projection
reconstruction
|
ANS: B
Data acquisition
refers to the method by which the patient is scanned to obtain enough data for
image reconstruction.
REF: p. 67
2.
Which of the following
refers to the size, shape, motion, and path traced by the X-ray beam as it
scans the patient?
|
a.
|
Beam geometry
|
|
b.
|
Projection profile
|
|
c.
|
Data acquisition
|
|
d.
|
Detector tracing
|
ANS: A
Beam geometry refers
to the size, shape, and motion of the beam and its path.
REF: p. 67
3.
A single ray in
computed tomography (CT) is:
|
a.
|
a beam of X-rays
emanating from the X-ray tube.
|
|
b.
|
a single straight
line path of an X-ray beam.
|
|
c.
|
the total
attenuation as measured by the detector.
|
|
d.
|
a collection of
beams gathered by the detector.
|
ANS: B
The line from the
X-ray tube to the detector is considered a single ray.
REF: p. 68
4.
A view in CT is:
|
a.
|
a specific way in
which the patient is positioned with respect to the detectors.
|
|
b.
|
the total
attenuation as measured by the detector.
|
|
c.
|
a collection of rays
for one translation across the object.
|
|
d.
|
a single straight
line path of an X-ray beam.
|
ANS: C
A collection of these
rays for one translation across the object constitutes a view.
REF: p. 68
5.
CT detectors generate
a signal that represents the attenuation as the ray moves across the slice.
This signal is called:
|
a.
|
a view sample.
|
|
b.
|
an acquisition
sample.
|
|
c.
|
a profile.
|
|
d.
|
a data sample.
|
ANS: C
The detector in turn
generates an electrical signal, which represents a signature of the attenuation
as the ray moves across the slice. This signal represents a profile.
REF: p. 68
6.
The total number of
data samples per scan or per slice in CT is the:
|
a.
|
number of data
samples per view times the number of views.
|
|
b.
|
number of views.
|
|
c.
|
number of detectors
plus the number of data samples per detector.
|
|
d.
|
number of data
samples per view plus the number of views.
|
ANS: A
DStotal = Number of detectors ´ Number of data
samples per detector or DStotal =
Number of data samples per view ´ Number of views.
REF: p. 68
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