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9 - 8
Image Quality
Problems during calibration
•
Check that grid lines are not visible in images taken with a table without grid e.g. biopsy
unit. If visible, see CCD camera calibration and maintenance on Page 5 - 22.
•
Calibration not completed takes unexpectedly long time. This can be a defective camera
or a mechanical alignment problem. Try to calibrate without external collimator, activate
switch or use a collimator with larger hole e.g. Axilla collimator.
NOTICE
Quadrant difference on patient images
When doing images on calibration plexiglas (also called: homogeneous acrylic plastic =
PMMA = Poly-methyl-met-acrylate) plates there can be a slight difference between the
quadrants, which will not be visible in patient images. Make sure that quadrant difference
exists in patient images before changing the CCD camera.
•
Calibrate the CCD camera.
•
If it is not disappearing, please contact the headquarter support center, HSC 24/USC, for
investigation.
Quadrant missing
•
Try to calibrate the CCD camera.
•
Please contact the headquarter support center, HSC 24/USC, for investigation.
White line/dot
•
Calibrate the CCD camera, move acrylic plastic plates after each calibration exposure.
•
If it is not disappearing, please contact the headquarter support center, HSC 24/USC, for
investigation.
Opdimar
Service
Always use Opdimar collimator in normal use.
Register 5
SPB7-230.061.11
Rev. 02
Troubleshooting guide
Page 8 of 14
07.03
CS PS 24
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Siemens AG
Medical Solutions
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