Konica Minolta 0902, Руководство по обслуживанию

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Chapter 3 Troubleshooting
3-46
3.4.15 S Value Fluctuation
3.4.16 Not Enough Contrast (Raw Data)
3.4.17 Different Density Left to Right
•
Expose solid image and compare with the solid image taken at the installation.
If there is a difference in the density left to right, cause 2.
3.4.18 Dosage Problem (Compatibility Problem with mAs Value and S
Value, Etc.)
Phenomenon Response
Fluctuation within
same equipment Fluctuate when the
sampling pitch is
different 87.5µm and 175 µm will not have identical S value due
to the difference in the read pitch, resulting as
difference in the luminance.
Fluctuate with identical
sampling pitch Confirm if the exposure conditions (X-ray quality,
distance, exposure area) and the process (condition
key, etc.) are identical on both exposures. S value will
fluctuate if there is any difference in them. S value also
will fluctuate if the ROI for the process is different.
Fluctuate compared with other REGIUS
MODEL 110 Redo the sensitivity calibration if the S value is
different even after confirming the exposure conditions
(X-ray tube, grid, X-ray quality (tube voltage), distance,
exposure range) were identical.
Fluctuate
compared with
different model Compare with 150 S value will be different if the x-ray tube, grid, or
exposure condition are not equivalent.
Compare with 170 (To be stated)
Compare with 190 (To be stated)
Compare with 330 S value will be different if the x-ray tube, grid, or
exposure condition are not equivalent.
Compare with 350 or
550 S value will be different if the x-ray tube, grid, or
exposure condition (beware of focal distance) are not
equivalent.
No. Cause Response
1 — Confirm the presence of the aperture.
2 — Confirm the X-ray tube voltage referring to the
recommended value in the medical notebook.
3 — Confirm the process parameters (E, F, H).
No. Cause Response
1 Alignment of the grid is not appropriate. Redo the exposure after adjusting the alignment.
2 The condensing unit in the optical unit is
dirty. Clean the condensing unit in the optical unit and redo
the unevenness calibration.
No. Cause Response
1 Sensitivity calibration is not appropriate. Redo the sensitivity calibration.
2 X-ray tube failure
(After measuring the mAs value and the
mR, there was no linearity comparing the
MR for 1 mA, 10 mAs, and 100 mAs
against the log-log.) Request the X-ray tube manufacturer to take
response.