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Digital QA And Artifact Test Review: #4
Test Description: Image Artifacts
Instructions: Answer all questions to get your test result.
1) The technologist should clean the CRT:
A
this is not a required system inspection activity
B
montly
C
yearly
D
weekly
2) Weekly technologist (or QC tech) responsibilities should include:
A
ensuring CR cassettes are erased
B
all of these
C
inspecting the hinges and latches of CR cassettes
D
ensuring IPs are clean
3) Service personnel should fix broken hinges of a cassette.
A
True
B
False, it should be disposed of
C
False, anyone can fix it
4) Dirt/ dust or fingerprints on the laser printer could:
A
could lead to a false positive diagnosis
B
can interfere with image quality
C
all of these
D
be mistaken for pathology
5) If artifacts are detected by the technologist, he or she should:
A
report it immediatly
B
ignore it
C
get to it when convenient
D
just wait and see if it happens again
6) Cracks in the IP of a CR cassette:
A
will not affect the image
B
can appear as areas of lucency on the image
C
will look like double exposed images
D
can lead to a grainy, noisy image
7) It is acceptable to place more than one image on one CR plate.
A
False, as this can complicate the processing procedure
B
True
8) What causes the 'halo' effect in digital imaging ?
A
using a high frequency grid
B
low mA
C
using a low frequency grid
D
too much edge enhancement
9) Which of the following areas can be associated with artifacts ?
A
imaging plate
B
image printer
C
all of these
D
CR plate reader
10) The halo effect is often noticed:
A
with low frequency grids
B
when a cassette is used backwards
C
with prosthetic devices
D
with low mA imaging
11) Which of the following can lead to image artifacts ?
A
tape
B
all of these
C
using a cassette backwards
D
kinks/ bends in an IP
12) Using too low of mA settings results in:
A
noisy images
B
artifact lines
C
poor contrast
D
acceptable images due to post-processing functions
13) How does the Moire pattern occur ?
A
only in DR imaging
B
it is a post-processing issue, but can be fixed without re-exposing the patient
C
in CR imaging, when the grid frequency and scan frequency are similar
D
in CR imaging, when the grid frequency and scan frequency are perpendicular to each other
14) Incorrect IP erasure
A
can lead to phantom images
B
will not affect the image
C
can lead to blurry images
D
is impossible
15) Dirt / dust within the CR reader can:
A
cause wavy lines
B
cause horizontal white lines
C
will not affec the image
D
cause dark lines
16) If a cassette is placed too close to a heat source
A
it will have sharp thick lines
B
it will have a bright, linear area
C
it will not be affected
D
it will have a dark, blurry area
17) Grids are needed in digital imaging
A
because there is no issue of grid cut off
B
grids are actually NOT needed as much with digital imaging
C
as digital is affected by scatter
D
all of these
18) The intermittent appearance of extraneous line patterns can be caused by problems in the electronics of the plate reader.
A
False
B
True
19) Severe alterations of image contrast can be from:
A
low mA
B
grid lines matching laser scanning pattern
C
malfunction of CR rollers within reader
D
post processing errors
20) Improper algorithm recognition can be from:
A
two exposures on one IP
B
lead aprons in light field
C
all of these
D
diagonal collimation
*select an answer for all questions
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