Quantum ODYSSEY HF Series, Service Manual

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Chapter 3 Calibration
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging, LLC
3-67
AEC REPRODUCIBILITY VERIFICATION (ONLY PERFORM ON UNITS EQUIPPED
WITH QG-AEC OPTION)
1. Set the Dynalyzer (or equivalent) for 75% trigger level on kVp. Ensure that
the meter is set to measure mR.
2. Place 10 CM of acrylic in the X-ray field, and set the generator Operator Con-
trol Panel to AEC mode, 45 kV, Normal Density.
3. Using Table 3-9, locate the model number of this generator and set the Oper-
ator Control Panel to the maximum mA setting shown in "SAMPLE 1 mA" col-
umn (large filament), then take 10 consecutive exposures recording the
measured mR values in AEC Reproducibility Data Sheet Table 3-11.
4. After the tenth exposure, select (coefficient of variation) COEFF VAR on Dyn-
alyzer; reading must be less than or equal to 0.05. If a Dynalyzer is not used,
calculate the C.O.V. (coefficient of variation) as above.
NON-AEC LINEARITY VERIFICATION
1. Set the Dynalyzer (or equivalent) for 75% trigger level on kVp. Ensure that
the meter is set to measure mR.
2. Set the generator Operator Control Panel to Manual mode, 50 kV (60kV if
150kV, max output Generator), 100 milliseconds exposure time, Normal Den-
sity.
3. Using Table 3-9, locate the model number of the generator and set the Oper-
ator Control Panel to the mA setting shown in "SAMPLE 1 mA" column (large
filament), then take 10 consecutive exposures recording the measured mR
and mAs values in Non-AEC Linearity Data Table 3-12.
4. Set the Operator Control Panel to adjacent mA station (indicated in the "SAM-
PLE 2 mA" column of Table 3-9) and take 10 consecutive exposures recording
measured mR and mAs values in Non-AEC Linearity Data Table 3-12.
5. Calculate the linearity using the worksheet provided in Table 3-12, and con-
firm it meets the required limit (< 0.1).