Selenia User Guide
Appendix A—System Specifications
124 MAN-03270 Revision 003
The kV and filter are both user selectable.
The exposure is terminated at a mAs value as determined by the
AEC system to yield a pixel count to which the unit has been
calibrated.
An exposure is aborted or prevented if:
The predicted exposure time exceeds the x-ray tube limits. The
predicted exposure time exceeds the safety backup timer setting.
The predicted exposure time is less than 400 msec when the grid
is in the x-ray field or less than 30 msec when the grid is out of
the x-ray field.
The user releases the exposure button prematurely.
There is an error within the Selenia FFDM system.
AEC exposure reproducibility meets MQSA requirements as
follows:
For a 4 cm thick average breast phantom, coefficients of
variation in mAs and digital values shall be less than 0.05 for
four consecutive exposures of this phantom under each of the
three AEC modes.
There is a "user-adjustable" scale factor that can be used to
increase/decrease the final x-ray exposure (mAs) by 15% for
each step from the default setting. A total of eight settings are
available on the Acquisition Workstation, which allows the user
to change the exposure from -55% of the default value to 160%
of the default value.
Note
AEC exposure adjustment is not available in all geographic
regions.
A.10 Hardcopy Film Printing Devices
This section lists the relevant technical characteristics for the hardcopy film printing
device.
A.10.1 Image Engine
20 cm x 25 cm (8 inches x 10 inches)
25 cm x 30 cm (10 inches x 12 inches), optional
Maximum Film Optical Density
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