EPEX/Omniflex IV System Service Manual
Adjustments and Calibration
4-45
AEC Preliminary Overall Gain Calibration
Note: DirectRay Detector
calibration must be
completed prior to
performing this procedure.
To determine the AEC overall gain:
Step
Action
1
From the Generator Toolbox, acquire and accept an image using the
technique below:
65 kVp
25 mA
250 ms backup time
AEC cell #2
Film screen 2
Grid Speed 2
72 in. HSID
Collimator in auto mode
No object in the beam, full field size
Grid in
2
Use DRIVEL to acquire a DV (Mean) for image center as the ROI.
3
Adjust the master gain pot on the pre-amp and repeat step until
DV (Mean) is between 1850 to 1900.
4
Verify AEC Cell terminates prior to backup time.
5
Ensure that the
DV (Mean) for image center cell #2 is between
1850 and 1900.
6
Enter the measured DV (Mean) for the image center in the AEC
Preliminary Overall Gain Calibration form. Refer to the sample
form below.
AEC Preliminary Overall Gain Calibration
EPEX Preliminary Overall Gain.cdr
Pass: ________
AEC Preliminary Overall Gain
Measured DV for Image Center (ROI) Cell #2 ________________
Содержание EPEX Omniflex IV
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