Chapter 7: Automatic Exposure Control (AEC)
Definium 5000 X-Ray System 5197809-1EN Rev. 4 (13 February 2008) 7-8
Operator Manual © 2008 General Electric Company. All rights reserved.
Acquire AEC Images
Acquiring images in the AEC mode requires precise light alignment and patient positioning.
Refer to Chapter 6: Image Acquisition
for more information about conducting an exam.
WARNING: Collimation must be active over the AEC chambers being used or FIXED mode must be used
in order to prevent possible patient over-exposure.
Use this process to produce images with the AEC feature.
1. Open an exam from the Worklist and select the protocols.
The Acquisition screen appears.
2. Select the protocol to perform.
3. Change the Patient Size, if necessary.
WARNING: It is critical to select the proper patient size on the Acquisition screen. The incorrect Patient
Size may result in an unnecessarily large radiation dose or multiple exposures.
4. Change the Receptor, if necessary.
5. Click [AEC], if necessary.
Depending on the current protocol, AEC may already be selected by default.
The AEC mode displays the Ion Chamber selections.
The Fixed mode removes the Ion Chamber selections.
You are able to alter this selection at any time to accommodate the requirements of a specific
examination.
6. Change the selected Ion Chambers, if necessary.
Selected (active) AEC cells will appear highlighted on the acquisition screen.
7. Make other technique adjustments as necessary.
You are able to adjust the kV, mA, and Focal Spot.
8. Confirm or select the Cu Filter, if necessary.
WARNING: The Cu filter selection on the screen is display only. The Cu Filter must be manually inserted
by the operator after selection.
9. Position the patient so that the anatomy of interest is centered over the selected AEC cells.
NOTE: The body part must cover the selected ion chambers in order to achieve the appropriate 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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