Siemens MAMMOMAT Novation DR Manual page 110

110
Random Artifacts
Problem
Increase in Defec-
tive Pixels and Lines
Structured Artifacts
Problem
Appearance of 24
"256 blocks" of dif-
ferent Densities or
Counts
Image not appear-
ing in One or More
"256 blocks"
Image not appearing
in one or more quar-
ters of Detector
Garbled, scrambled,
or truncated (from
edges of long axis in)
images not appearing
in one or more quar-
ters of Detector
Fine Linear Pattern,
Parallel to Long
Axis, in One or More
"256 Blocks" (usu-
ally more pro-
nounced on an
edge)
Other Artifacts
Problem
White lines towards
the center of panel
(Bar Code)
Dark lines / weak
lines
MAMMOMAT Novation DR
Cause
Defective pixel file requires updat-
ing.
Cause
Gain calibration not turned on.
Detector not calibrated properly.
Detector defective.
Detector defective.
Poor cable connection.
Electronic interference with or along
cable.
Electromagnetic noise interfering with
Detector Read Out.
Cause
Detector defective.
Lines need to be mapped out.
SPB7-250.815.06.02.02
12.05
Recommended Action
•
Perform the bad pixel correction. (
Refer to "Creation of new pixel
map" on (Creation of a new pixel
map (if necessary) / p.
Recommended Action
Follow calibration procedure.
Detector might have to be replaced
contact the Service Center.
Detector might have to be replaced
contact the Service Center.
Check pins and Detector connec-
tion to PXCM.
Identify and isolate sources of inter-
ference; examine the cable path-
way.
Shield Motors, power sources, and
so on, located in proximity to the
detector.
Recommended Action
Detector might have to be replaced
contact the Service Center.
Contact the Service Center.
Page 110 of 116
CS SD 24
Appendix
76)).
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