GE Senographe DS, Manual

Page: 1023 / 1810

GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card TSG A010 - Troubleshooting Bad Pixel Calibration Failure
Page no. 1023 Chapter 9
JC-TSG-A-010.fm
ILLUSTRATION 2 - DECISION TREE FOR BAD PIXEL CALIBRATION FAILURE
3-2-1 Load Detector Parameters
Check on the Service Desktop home page that the detector ID is the same as the one on the detector
CD-ROM or floppy disk. If any doubt, also check that the actual labeling on the detector matches the
detector ID written on the detector CD-ROM or floppy disk.
• If the detector IDs are the same, return to the troubleshooting decision tree in Illustration 2 , page
1023 and continue with the other troubleshooting steps.
• If the detector IDs are not the same, reload the detector parameters according to Load Detector
Parameters on page 1103 in Job Card D/R A141 - Image Receptor/Digital Detector , then return to
the troubleshooting decision tree in Illustration 2 , page 1023 and continue with the other trouble-
shooting steps.
3-2-2 Setup Checks
For bad pixel calibration, it is important that:
• The flat field phantom used in this procedure is very clean and free from imperfections
• All surfaces in the beam (detector, tube, filter, etc.) are very clean and free from imperfections, which
can affect calibration.
• The flat field phantom is well positioned on the detector: centered laterally, well covered on each
detector edge.
3-2-3 Collimator Blades Check
If you see a white band on the border(s) of a flat field image, it may be due to the shadow of the collima-
tor blade or the collimator blade itself.
Load Detector Parameters (see section 3-2-1 ,
Load Detector Parameters on page 1023 )
Perform Bad Pixel Calibration (see Job Card CAL
A041 - Bad Pixel Calibration on page 1693 )
Setup checks (see section 3-2-2 , Setup Checks on
page 1023 )
Perform Bad Pixel Calibration (see Job Card CAL
A041 - Bad Pixel Calibration on page 1693 )
Bad Pixel calibration fails
NO
Bad Pixel calibra-
tion passes?
Perform post-corrective ac-
tions (see
section 4-1
,
Cali-
bration to be performed after
bad pixel calibration
on page
1026 ).
Detector ID of CSD = Detector ID of
Detector CD-ROM or Floppy Disk?
Bad Pixel calibra-
tion passes?
YES
.End
Collimator blades check (see section 3-2-3 , Collimator Blades
Check on page 1023 )
NO
YES
YES
NO