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Digital flat panel x-ray detector (FPXD)
mar555 marresearch

The mar555 flatpanel is a novel type of X-ray detector that consists of a TFT frame coated with a thin Selenium layer. Conventional X-ray detectors like the image plate or the CCDs count visible light photons. They need a phosphour that converts X-rays into light photons. This conversion process greatly contributes to degradation of the signal (spreading out, loss). In contrast, in a Se-coated flatpanel detector, X-rays directly produce charges in the Se-layer, where they are collected by the individual TFT pixel electrodes. The elimination of point spreading not only enables measurements of very large units cells but also enhances the signal-to-noise ratio.

Since the TFT panels are available in quite large sizes and Selenium can be coated on large areas using standard deposition techniques, building up an X-ray detector with a huge active area of 430 x 350 mm2 is relatively inexpensive compared to tiled CCD-detectors and - even more - to pixel detectors.
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