FujiFilm CR-IR341 Service Manual page 629

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C
ONTENTS
9.2 Shading/Sensitivity Correction
Shading/sensitivity correction should be performed in the following sequence.
[1] Initial setting for shading correction data recording
[2] Uniform exposure of IP
[3] Conveyance of IP
[4] Correction for shading and sensitivity
[5] Check on correction results
[6] Set Sensitivity Correction
If the correction results are abnormal or an increased degree of sensitivity correction accu-
racy is called for, make a machine shipment control sensitivity correction. After machine
shipment control sensitivity correction, verify the correction results.
CAUTION
After completing the shading/sensitivity correction, back up the scanner set data.
For shading/sensitivity correction, use the following jigs and external devices.
• V-type and ST IP: Use an IP of 14" x 14" (35cm x 35cm) or 14" x 17" (35cm x 43cm)
size, free from soil or scratch.
• X-ray source
• Dosimeter: Used to measure the dosage during uniform exposure.
• Stopwatch: Used to check the elapsed time after uniform exposure.
• ULP or LPII.
[1] Initial Setting for Shading Correction Data Recording
(1) Activate M-Utility.
"9.1 Adjusting Read Start Position and Read Width,
Utility"
(2) Select "5. SCANNER UTILITY", "7. SHADING/SENSITIVITY" and "1. REC MODE" in
sequence.
The machine is set in the mode for recording the shading correction data.
(3) Exit M-Utility and switch to the Routine Mode.
[2] Uniform Exposure of IP
(1) Uniformly expose an IP of 14" x 14" (35cm x 35cm) or 14" x 17" (35cm x 43cm) size at
0.5 to 9.99 mR (1 mR recommended).
At this time, measure the dosage with a dosimeter. The voltage should be aligned to
80 kV.
SUPPLEMENTARY NOTE
The dosage value of the X-ray exposure represents a value at the center of an IP. However,
the dosimeter cannot be located at the center of the IP during uniform exposure. The dosage
values at the center and outer periphery of the IP should be measured in advance, and the
difference between them should then be calculated to determine the correction dosage value.
(2) Determine the correction dosage value.
Round off the measured dosage value in mR to the second decimal place, and write
down the resulting value on your notepad.
009-051-05
11.20.99 FM2638
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CR-IR341 Service Manual
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MC - 138
Activating and Exiting M-
MC - 138