Appendix B Calibration (DiRex System)
Revision W HF Series X-ray Generators - Service Manual
B-40 Quantum Medical Imaging, LLC
AEC CALIBRATION
CAUTION! Before calibrating unit, perform warm-
up procedures recommended by tube manufac-
turer or the warm-up procedure described in
Chapter 3 of the Operator’s Manual.
IMPORTANT! Before performing each AEC calibra-
tion procedure, verify the correct Film/Screen is
displayed on the calibration screen (shown in top
left field).
In most DR or CR Film Plate systems, the entire
imaging area of the digital receptor or CR Film
Plate must be covered with acrylic in order to
obtain accurate "S" or "REX" values used for the
procedures that follow. Refer to the calibration
instructions provided with digital or CR system for
specific "S" or "REX" values required for AEC cali-
bration.
IMPORTANT! Always place a CR film plate in the
cassette holder when taking any measurements
or when calibrating, even if the calibration step
does not require a film to be exposed.
The following procedures must be performed to ensure successful AEC calibration
of the HF Series X-ray generator when configured as part of the DiRex System
(i.e., integration to Agfa Computed Radiography (CR) Film Plate). Table B-4
shows a summarized presentation of the AEC calibration procedure. An AEC cali-
bration Worksheet is provided in Table B-5 for recording calibration data.
Table B-4. CR System AEC Calibration Procedure Sequence
FILM/SCREENS TO BE
CALIBRATED
REQUIRED AEC CALIBRATION PROCEDURES/
SPECIAL INSTRUCTIONS
WALL STAND 72" SID
FILM/SCREEN
(SLOWEST SPEED,
LARGEST SID)
1. Perform "Ion Chamber Balancing" procedure.
2. Perform "AEC MAS Balance" procedure for wall
stand ion chamber.
3. Perform "AEC Optical Density (OD) Calibration":
a. Set desired "base" optical density
b. Set "AEC Ref" to 1200.
c. Adjust ion chamber’s MASTER GAIN potenti-
ometer until base density is achieved in
acquired images.
4. Perform "AEC KV Calibration".
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