DR Detector Calibration|Calibrating the DR Detector|32
Fixed DR Detector (Pixium RF4343 FL) Exposure Sequence
For using the fixed DR Detector, the temperature difference between calibration and usage must
be within the recommended range of +/-6°C. Check the environmental conditions and observe the
warming-up time of the DR Detector.
Modality Settings
The indicative exposure levels for each exposure are specified by the DR Calibration Tool.
Table 13: Modality settings
Focus large focus
SID 135 cm
Grid No grid is used.
Position The X-ray tube must be centered on the DR detector. Check the
position using the collimator light, before the filter is mounted.
Filtration Mount the Agfa calibration filter (Cu 1.5 mm). Check that there is
no additional filtration.
Collimation Maximum collimation area
Note If the exposure settings used for a previous calibration are known, use these settings.
On modalities that support automatic collimation, the collimation settings are applied automatical-
ly and must be checked by the user.
The collimator may limit the X-ray field. To overrule the limitation, the collimator must be set to
manual collimation using the positioning controls in the software console and the collimation must
be applied manually.
Exposure Sequence
Procedure:
1. Allow the DR Detector to warm up for 4 hours before performing the calibration. During warm-
up no exposures should be made.
2. Set the exposure parameters to the indicative value for the exposure level.
3. Make exposures as instructed by the DR Calibration Tool.
Calibration steps are performed for each mode (continuous fluo, pulsed fluo, rad, rapid se-
quence) and different dose settings (kV, mAs or mA and ms). Use the software console to set the
values that are displayed on the Calibration Tool and then press exposure button or pedal.
For each mode, exposures with 4 different doses settings are requested.
The images made at the first dose setting will be used to calculate the gain calibration map.
The images made at the other dose settings will be combined to calculate the defect calibration
map. This calculation can take a long time, up to several minutes!
The requested dose setting is specified in µGy and a suggestion is provided on how to accom-
plish this by setting kV and mAs (or mA and ms). Note that the suggested settings may not effec-
tuate the requested dose: some panels have a higher sensitivity, there may be temperature ef-
fects etc. The DR Calibration Tool may instruct to increase or decrease the dose settings to reach
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