Quantum ODYSSEY HF Series, Service Manual

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Appendix D Calibration (Using Generator Service Tools)
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC
D-47
* Only required on 150 kVp systems
Ion Chamber Balancing (Three-field Chambers)
On systems using a three-field ion chamber, the chamber detectors must be
balanced prior to performing AEC calibration (refer to the ion chamber manu-
facturer’s instruction manual). When balanced, the mAs will be approxi-
mately the same (±5%) for exposures taken using any of the three
chambers, or with two or more chambers selected simultaneously. This pro-
cedure must be performed on each ion chamber used in the system (for
example, both table and wall ion chambers when equipped with two). Before
proceeding, check that the ion chamber detectors have been correctly config-
ured so when the chamber select buttons on the operator control panel are
pressed, the appropriate ion chamber detector is enabled. If not, refer to
Table D-3. AEC Calibration Worksheet
Film/Screen Combination: Table 40 Wall 40 Wall 72
BASE OD CALIBRATION
Setting: 50 kVp, 200L mA, 5 cm
Optical Density:
Offset
AEC kVp CALIBRATION
Setting: Step 1 - 50 kVp, 200L mA, 5 cm
Optical Density:
Setting: Step 2 - 60 kVp, 200L mA, 10 cm
Optical Density:
Setting: Step 3 - 80 kVp, 200L mA, 15 cm
Optical Density:
Setting: Step 4 - 100 kVp, 200L mA, 20 cm
Optical Density:
Setting: Step 5 - 110 kVp, 200L mA, 25 cm
Optical Density:
Setting: Step 6 - 120 kVp, 200L mA, 30 cm
Optical Density:
Setting: *Step 7 - 130 kVp, 200L mA, 30 cm
Optical Density:
Setting: *Step 8 - 140 kVp, 200L mA, 30 cm
Optical Density: