Appendix B Calibration (DiRex System)
Revision W HF Series X-ray Generators - Service Manual
B-56 Quantum Medical Imaging, LLC
5. Process the CR Film Plate to determine the density level (referred to as
the "LGM" value).
a. If the sensitivity value is within acceptable range as defined by man-
ufacturer, press the First Point button to proceed to the next AEC kV
calibration point.
a. If not within range, press the Measured Level value button (located
directly below "Measured Level" label), and enter the measured LGM
value using the keypad, then press Enter. Press First Point button
to proceed to the next AEC kV calibration point.
DO NOT TAKE ANY
FURTHER EXPOSURES AT THIS SETTING.
6. Repeat the previous steps for the 60, 80, 100, 110, 120, and, if 150 kV
system, 130 and 140 kV calibration points, placing the specified thickness
of acrylic in the x-ray beam as indicated on the AEC KV Calibration screen
for each kV calibration point, and taking one exposure per kVp calibration
point until all the measured density (LGM) values are within required
range.
7. Press the Back button to return to the AEC Calibration menu.
8. This completes AEC calibration for this particular film/screen combination.
Repeat AEC calibration procedures for all additional film/screen combina-
tions that will be used with the system.
9. Verify AEC calibration by taking several exposures in AEC mode and
checking the resulting "LGM" value. If necessary, repeat AEC calibration
procedure to further adjust AEC accuracy.
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