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Direct-conversion flat-panel X-ray image sensors for digital radiography

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2 Author(s)
Kasap, Safa O. ; Dept. of Electr. Eng., Saskatchewan Univ., Saskatoon, Sask., Canada ; Rowlands, J.A.

Advances in active-matrix array flat panels for displays over the last decade have led to the development of flat-panel X-ray image detectors. Recent flat-panel detectors have shown image quality exceeding that of X-ray film/screen cassettes. They can also permit the instantaneous capture, readout, and display of digital X-ray images and, hence, enable the clinical transition to digital radiography. There are two general approaches to flat panel detector technology: 1) direct and 2) indirect conversion. The present paper outlines the operating principles for direct-conversion detectors based on the use of photoconductors. It formulates and reviews the required X-ray photoconductor properties for such applications and examines to what extent potential materials fulfill these requirements. The quantum efficiency, X-ray sensitivity, noise, and detective quantum efficiency factors are discussed with reference to current and potential large area X-ray photoconductors

Published in:

Proceedings of the IEEE  (Volume:90 ,  Issue: 4 )

Date of Publication:

Apr 2002

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