HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC A-13
Appendix A AEC Calibration with DR or CR Film Plate
AEC Calibration Instructions - Single Panel, Dual Ion Chambers
The following procedure is used to perform AEC calibration of generators
used with a single receptor panel system (e.g., CXDI-50G or CXDI-50C porta-
ble receptor), integrated with the generator, where the single DR panel can
be used with more than one ion chamber.
Proceed as follows:
1. Verify system is configured correctly per "CANON DR SYSTEM CON-
FIGURATION INSTRUCTIONS" procedure provided in this appendix
(in particular, "Universal" is set to "QV-800" as described in step 6).
2. Insert DR receptor in the most commonly used receptor cabinet (this
cabinet’s ion chamber should be connected to WALL#1 connector
A11J2 on AEC Control Board) and collimate down to proper image
size.
3. If not already done so, access the AEC Calibration Menu (refer to
Chapter 3).
4. Press the key next to the Film/Screen Combination field (upper
left field) to select WALL 40" film/screen combination for calibration.
5. The FILM SPEED field shows the default film speed setting for the
selected film/screen combination (400). If not, press the up or down
keys next to the FILM SPEED field until 400 film speed setting is
displayed.
6. When film/screen combination name and film speed settings are cor-
rect, press the key next to the AEC OD Calibration field to proceed
with AEC Calibration. The AEC Optical Density Calibration Screen is
displayed:
Figure A-5. AEC Optical Density Calibration Screen
7. This screen is used to calibrate the digital receptor or CR film plate to
a user defined optical density setting (e.g., 1.30). This is accom-
plished by comparing the digital receptor’s specified sensitivity values
BASE
OPTICAL
DENSITY
SELECT KEYS
AEC REF
ADJUSTMENT
KEYS.
(ONLY ADJUST IF
DENSITY CAN
NOT BE
ACHIEVED WITH
MASTER GAIN
POT. AT MAX.
ADJUSTMENT)
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