Varex Imaging XRpad2 4343 User Manual page 10

For Your Safety
Automatic Exposure Detection (AED) Mode
The AED mode requires a sufficient X-ray dose rate to the detector
WARNING
surface to trigger image acquisition. The required dose rate can vary at
different use conditions. The system integrator must evaluate the AED
operation with the complete X-ray setup in order to secure the proper
image acquisition in AED mode.
Depending on conditions, including but not limited to, environmental
conditions, installation method, X-ray system setup, and subject to be
imaged, the use of AED mode may result in false trigger or no trigger
of X-ray image acquisition. The risk of false trigger or no trigger of
X-ray image acquisition must be assessed for the specific intended use
and application. For the most reliable image acquisition method, use
of the external or software trigger mode to synchronize with the X-ray
source is recommended.
The external sync mode is the default acquisition mode, and the
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detector needs to switch into the AED mode to use the Auto Exposure
detection. It is important that a settling time for the AED is
implemented by the system integrator. If the settling time is too short,
the image can show artifacts.
The AED on-time is limited and should be turned off directly after
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acquiring the image. Staying longer in AED mode will reduce the
battery duty cycle and heat up the detector.
Do not apply any, handling, loading, mechanical shock, or electronic
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noise to the detector while it is in AED mode. These actions can start
an unwanted acquisition (false trigger). If a false trigger is applied to
the detector, the detector will not be able to react on a real X-ray
exposure until it has acquired the false image.
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XRpad2 4343