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Review NMTCB 3.001-3.021 Questions and Answers Graded A+
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Review NMTCB 3.001-3.021
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Review NMTCB 3.001-3.021A. is correct.
The computer has made SPECT imaging possible in both coordinating the collection of
data and in performing the complex calculations necessary for reconstruction in image
production and analysis. - answer3.001 All SPECT imaging devices are computer
controlled for both data acquisition and data analysis.
A. true
B. false
D. is correct.
Volume elements, or voxels, represent the pixel with the added dimension of depth, or
volume. - answer3.002 Pixels are picture elements of the image matrix that represent
individual location counts in the x and y directions. In SPECT imaging, adding depth
makes pixels become:
A. matrices
B. point sources
C. vertical elements
D. volume elements
B. is correct.
A composite of the ray sums is the basis for back projection reconstruction. It may be
defined as an even projection along the path of the acquired angle. - answer3.003 In
SPECT imaging, parallel-hole collimators are used to insure that the detectors see only
the photons along a narrow band that extends from the detector to organ in the radius of
rotation. This narrow band is called a:
A. column
B. ray
C. fan
D. beam
A. is correct.
The number of projection images will vary with the size of the object being imaged and
the resolution of the camera system.
A projection is simply the count rate profile of the subject at a specified angular
orientation.L - answer3.004 Scanning of a ray across a plane in the subject at a
particular angular increment forms a(n):
A. projection
B. plane
C. funnel
D. column
B. is correct.
, Using a backprojected image which represents a composite of all the ray sums in a
cross-sectional view of the original field, the image is reconstructed. - answer3.005 After
a complete set of projections are obtained, the computer sorts the data and reconstructs
an image of the activity distribution in the______of interest.
A. projection
B. plane
C. funnel
D. column
D. is correct.
"Star" artifacts are not present in the original object and will degrade images and
decrease resolution. - answer3.006 The "star" effect in image reconstruction may be
created by:
A. septal penetration
B. patient motion
C. collimator contamination
D. artifacts produced by the overlapping of ray sums
E. all of the above
C. is correct.
Increasing the number of projections acquired can significantly reduce the "star" effect.
Note that there is no increase in collection time and sufficient counts per pixel should be
provided in a high count study. - answer3.007 The "star" effect may be reduced by:
A. increasing the acquisition time per angle
B. increasing the count rate
C. increasing the number of projections acquired
D. increasing the target-to-detector distance
B. is correct
The introduction of a filter to individual projections is one of the most common methods
for removing the "star" artifact. - answer3.008 The "star" artifact may be removed by:
A. back projection
B. filtering
C. using only point sources
D. increasing detector-source distance
C. is correct.
Photons that originate in the center of the subject are more likely to be absorbed
(attenuated) by overlying structures than those at the periphery of the subject.
Manufacturers have software correcting for attenuation loses. - answer3.009
Attenuation correction methods are used in SPECT imaging because:
A. most SPECT studies are high-count studies which need to be averaged
B. attenuation is NOT a problem with SPECT imaging
C. the attenuation of photons by the patient's body makes it difficult to obtain accurate
radiotracer uptake information
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