HD/HD+ Detectors
This section shows the Calibration History when the currently active detector is a HD or HD+ Detector. Here, you can preform detector calibration.
Calibration History
This is where you can view a list of calibrations performed on the Detector and their result. By default, only calibrations preformed in the past month are shown. You can change the date range with the Start and End Date buttons.
Performing a Calibration
To Perform a Calibration, press the Start Gain Calibration button. A Calibration Dialog will be shown.
Set the Technique on your X-Ray unit.
- Stationary: 70 kVp an 1 mAs at an SID of 40" (101.6cm)
- Mobile: 70 kVp and 1 mAs at an SID of 30" (76.2cm)
These are a starting point and may need to be adjusted for you're particular X-Ray unit.
When a Generator has been configured. The starting technique will be set automatically. Additionally, controls for kVp and mAs are shown, allowing you to adjust technique as you proceed through the calibration.
Any obstructions such as phantoms, soft sleeves or covers, table tops, grids, x-ray tunnels, etc, should be removed. Nothing should be between the primary beam and the surface of the detector.
The detector should be fully exposed. The collimator should be fully open.
Neither the detector nor the X-Ray unit should be held by a person. Both need to remain in exact positioning during the calibration procedure with people as far away from the primary beam as possible.
When the system is Ready for Calibration, press the Start Button. You can also abort the calibration by pressing the Cancel button.
When the detector is ready for exposure, the Trigger button will be shown.
Press half-way down on the generator foot-switch or hand-switch. Wait until your generator indicates that it is prepped for exposure.
Press the Trigger button, then press the rest of the way down on the foot-switch or hand-switch. The system will automatically capture the image.
Once you press the Trigger button, there will be about 5 seconds before the Detector captures the image. If you miss this window, you will need to retake the exposure.
Once the image has been acquired, it will be shown. Here you can review the image for things like objects between the primary beam and the surface of the detector, collimation, or alignment issues.
Below the image is the Achieved and Target Pixel Value.
When the Achieved Pixel Value is Under the Target Pixel Value, the exposure was too low. Increase the technique, Reject the image, and expose the detector again.
When the Achieved Pixel Value is Over the Targe Pixel Value, the exposure was too high. Reduce the technique, Reject the image, and expose the detector again.
The goal is to reach the Target Pixel Values without going over.
When the Achieved Pixel value is within ±5% of the Target Pixel Values, the Accept button will be enabled. Pressing this button will advance the Calibration to the next Exposure.
The number of exposures is determined by the detector. Repeat the above steps until all exposures have been acquired. When all necessary Exposure have been acquired, you will see the following screen.
Pressing the Generate button will generate new calibration data and upload it to the detector.
The system will Finalize the calibration.
When Finalization is complete, you can press the Close button to close the dialog.
