Chapter 3 Calibration
Revision W HF Series X-ray Generators - Service Manual
3-64 Quantum Medical Imaging, LLC
Optical Density Accuracy Verification
Take several sample AEC films to verify optical density meets facility and/
or applicable statutory or regulatory requirements (or at least within
±10% of desired (base) optical density). If not repeat AEC Optical Den-
sity and KV calibrations.
Copy Film/Screen Utility
On the AEC Calibration Menu (see Figure 3-37), an AEC calibration data
copy utility is provided (Copy Film/Screen key). Following calibration
of the first film/screen combination, stored AEC calibration data, such as
the kV curves and AEC reference data, can be copied from the first film/
screen combination to other film/screen combinations used with the sys-
tem to reduce calibration time.
For example, if the preceding calibration was done for the wall stand 40
inch SID film/screen combination (i.e., Wall 40"), calibration data can be
copied to the radiographic table’s 40 inch SID film/screen combination
(i.e., Table 40") using the Copy Film/Screen utility. Although all required
AEC Calibration procedures must still be performed, this will set the cali-
bration values for the Table 40" film/screen combination to fairly accurate
settings, thereby reducing the number of exposures required for calibra-
tion. The Copy Film/Screen utility is most beneficial when the film screen
combination being copied to has the same cassette screen, film speed,
ion chamber and grid as the film/screen combination it is being copied
from. Nevertheless, calibration is likely to be expedited even when one
or more of these elements differ. Proceed as follows:
1. If not displayed, access the AEC Calibration Menu (see Figure 3-37).
2. Press the key next to the Film/Screen field (upper left field) until the
the film/screen combination you want to copy calibration data to is
displayed.
3. Press the key next to the Copy Film/Screen field.
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