Case 2: Entire Image Is Too Bright, Whitish (With Subject Structure) - Konica Minolta REGIUS 190 Service Manual

4.3.3

Case 2: Entire image is too bright, whitish (with subject structure)

Cause
The output density of the G-processing parameters
1
is too low overall.
The X-ray dose is extremely low or non-existent.
2
S-value (i.e., gain) setting of the REGIUS Console
3
is too low (for FIX processing and non-processed
images)
Failure in sensitivity correction
4
For some reason, the ROI identified for processing
5
is not correctly set.
There is a problem with the REGIUS 190's photo-
6
multiplier or high-voltage system.
1) ADB2's photomultiplier high-voltage switch is set
to OFF.
2) Replace the ADB2 if it is faulty. --> Replace the
ADB2.
3)Photomultiplier is damaged.
Remedy
Set the H/L brightness setting from the G-processing
parameters to a higher value.
(For more details, refer to the Image Processing
Adjustment Manual)
• Check the exposure conditions, and confirm that
the Exposure switch is not released during X-ray
exposure.
• Confirm the X-ray dosage using a quantimeter.
Correct the S value setting to a suitable level.
Review the sensitivity correction.
Correct the ROI setting to the appropriate position.
1) Set the switch to ON.
2) Replace the ADB2. Refer to
of ADB2 (A/D board),
3) Replace the photomultiplier.
of Photomultiplier (PMT), p.75"
REGIUS MODEL 190 Service Manual Ver.1.00 2004.11.01
4.3 Troubleshooting for Image Quality
"2.7.4 Replacement
p.86".
"2.6.1 Replacement
139