Chapter 7: Automatic Exposure Control (AEC)
Definium 5000 X-Ray System 5197809-1EN Rev. 4 (13 February 2008) 7-3
Operator Manual © 2008 General Electric Company. All rights reserved.
Figure 7-2 Example AEC exposure completed (normal operation)
The Applications software sets two limits for AEC operation: 512 is the maximum mAs. 2 seconds (2000
milliseconds) is the maximum exposure time.
NOTE: When either one of the above limits is reached, the Applications software terminates the exposure.
For example, Equation 7-1 demonstrates that with a console selection of 250 mA, the system
reaches the 2000 millisecond maximum exposure limit before it would reach the 512 mAs limit.
Equation 7-1 AEC exposure limit calculation
(the 250 mA console selection) X (2000 milliseconds) = 500 mAs
NOTE: The Applications software also uses a built-in formula to set limits for AEC operation in addition to
the two limits stated above. This formula limits mAs to a value less than 512 mAs and exposure
time to a value less than 2000 msec, depending upon the technique selected. Due to these
limitations, you may reach an AEC limit even with a mAs value less than 512 mAs and with an
exposure time less than 2000 msec. If either of these events occur, the Applications software
terminates the exposure.
FOR TRAINING PURPOSES ONLY!
NOTE: Once downloaded, this document is UNCONTROLLED, and therefore may not be the latest revision. Always confirm revision status against a validated source (ie CDL).
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