Troubleshooting For Image Quality; Flow Of Troubleshooting; Case 1: Entire Image Is Too Dark (With Subject Structure) - Konica Minolta REGIUS 190 Service Manual

4.3 Troubleshooting for Image Quality

4.3 Troubleshooting for Image Quality
In this paragraph, remedies for image quality troubles as listed below are described.
Horizontal stripes, vertical stripes, S-value variation, poor contrast, irregular L/R brightness, dose abnormalities,
image disparity, white blotches, black blotches, monitor display errors (OK for film), image duplication.
4.3.1

Flow of Troubleshooting

• For each of the following cases, carry out investigation of causes in sequence from Step 1, and take an appro-
priate action. If the problem is not resolved by any action, please report the corresponding details to the man-
ufacuturer(i.e., quality assurance).
• Similarly, for cases which are not included in the following description, please report the corresponding details
to the manufacturer (i.e., quality assurance).
• After replacement of the optical unit, carry out PLL adjustment, side start-point adjustment, uniformity calibra-
tion, and sensitivity calibration.
4.3.2

Case 1: Entire image is too dark (with subject structure)

Cause
The output density of the G-processing parameters
1
is too high overall.
The X-ray dose is too high (for FIX processing and
2
non-processed images)
3 S value (i.e., gain) setting of the REGIUS Console
is too high (for FIX processing and non-processed
images)
4 Failure in sensitivity correction (for FIX processing
and non-processed images)
For some reason, the ROI identified for processing
5
is not correctly set.
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REGIUS MODEL 190 Service Manual Ver.1.00 2004.11.01
Remedy
Set the H/L brightness setting of the G-processing
parameters to a lower value.
(For more details, refer to the Image Processing
Adjustment Manual)
Review the exposure conditions to determine
whether the X-ray dose is appropriate.
Correct the S value setting to a suitable level.
Review the sensitivity correction.
Correct the ROI setting to the appropriate position.