Development of a novel direct X-ray detector using photoinduced discharge (PID) readout for digital radiography

We developed a novel direct X-ray detector using photoinduced discharge (PID) readout for digital radiography. The pixel resolution is 512 x 512 with 200 mu m pixel and the overall active dimensions of the X-ray imaging panel is 10.24 cm x 10.24 cm. The detector consists of an X-ray absorption layer...

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Veröffentlicht in:Journal of instrumentation 2013-02, Vol.7 (2), p.1-5
Hauptverfasser: Heo, D, Jeon, S, Kim, J-S, Kim, R K, Cha, B K, Moon, B J, Yoon, J
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Sprache:eng
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Zusammenfassung:We developed a novel direct X-ray detector using photoinduced discharge (PID) readout for digital radiography. The pixel resolution is 512 x 512 with 200 mu m pixel and the overall active dimensions of the X-ray imaging panel is 10.24 cm x 10.24 cm. The detector consists of an X-ray absorption layer of amorphous selenium, a charge accumulation layer of metal, and a PID readout layer of amorphous silicon. In particular, the charge accumulation is pixelated because image charges generated by X-ray should be stored pixel by pixel. Here the image charges, or holes, are recombined with electrons generated by the PID method. We used a 405 nm laser diode and cylindrical lens to make a line beam source with a width of 50 mu m for PID readout, which generates charges for each pixel lines during the scan. We obtained spatial frequencies of about 1.0 lp/mm for the X-direction (lateral direction) and 0.9 lp/mm for the Y-direction (scanning direction) at 50% modulation transfer function.
ISSN:1748-0221
1748-0221
DOI:10.1088/1748-0221/8/02/C02045