Quantum ODYSSEY HF Series User Manual

Appendix B Calibration (DiRex System)
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC B-53
d. Take an exposure at the setting indicated on the AEC Optical Density
Calibration Screen (i.e., 50 kVp, 200L mA, normal density).
e. Process the CR Film Plate to determine density level (referred to as
the "LGM" value).
f. If the LGM value is within acceptable range of the Target Level as
defined by the CR Film Plate manufacturer, press the Next button to
save the setting and proceed to AEC KV Calibration.
g. If not within range, perform the following adjustments:
Note: If the system is equipped with "standard
type" AEC Board A11 (AY40-031S), the "Table
Gain Adj. Potentiometer" is A11R22 and the "Wall
Gain Adj. Potentiometer" is A11R23. If the sys-
tem is equipped with "Universal type" AEC Board
A11 (AY40-027S), the "Table Gain Adj. Potenti-
ometer" is A11R77 and the "Wall Gain Adj. Poten-
tiometer" is A11R79.
i. Adjust Table Gain Adj. potentiometer (if calibrating the table
receptor) or Wall Gain Adj. potentiometer (if calibrating the
wall receptor), and repeat exposure. Continue until the mea-
sured LGM value equals the Target Level setting to within CR
System manufacturer’s specification.
ii. If you still cannot achieve the Target Level setting, set Table
Gain Adj. potentiometer (if calibrating the table receptor) or
Wall Gain Adj. potentiometer (if calibrating the wall receptor)
to mid-range, then adjust the ion chamber’s MASTER GAIN
potentiometer until roughly the desired LGM is obtained. Fur-
ther fine-tuning can then be achieved by adjusting the Table
or Wall Gain Adj. potentiometer as described in the previous
step.
iii. If the measured LGM value still does not equal the Target
Level setting even with the ion chamber’s MASTER GAIN
potentiometer set to maximum gain position, increase each
chamber detector gain and perform the "AEC MAS Balance
Verification" procedure. Repeat AEC Optical Density calibra-
tion.
iv. If the measured LGM value still does not equal the Target
Level setting after adjusting the MASTER GAIN and gain of
individual detectors, reduce the AEC Reference until you
obtain the desired LGM value.
3. If the selected film/screen combination is not the first one to be cali-
brated with the system, perform the following steps:
NOTE
The series of
AEC optical
density
measurements
should be
repeated as
many times as
required until
optical density
is sufficiently
accurate to
meet
regulatory and
facility
requirements.

Quantum ODYSSEY HF Series Specifications

General

Brand	Quantum
Model	ODYSSEY HF Series
Category	Medical Equipment
Language	English