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Proceedings Paper

Performance of a novel 43-cm x 43-cm flat-panel detector with CsI:Tl scintillator
Author(s): Tatsuya Yamazaki; Tomoyuki Tamura; Makoto Nokita; Satoshi Okada; Shinsuke Hayashida; Yoshihiro Ogawa
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Paper Abstract

We have developed a novel flat-panel detector with CsI:Tl scintillator. The detector consists of a single piece 43cm x 43cm amorphous silicon thin-film transistor (TFT) array with MIS (metal-insulator-semiconductor) photoelectric converter having a pixel pitch of 160μm coated with a needle-like crystal CsI:Tl scintillator. Signal chain was totally revised from current detector utilizing an innovative sensor technology. The novel detector and current detector were equipped to a digital radiography system allowing a quantitative and comparative study. Results show that the novel detector has a linear response covering the radiographic exposure range. It has a moderate modulation transfer function (MTF) sufficient to the radiography tasks and effective to suppress the aliasing. The detective quantum efficiency (DQE) was almost twice than the current detector. The result of contrast-detail phantom exposed with a 1/2x dose level is equivalent to that of current detector with a 1x dose level. These results show that performance of novel detector is superior to and expected to reduce the patient dose in half than current detector due to higher DQE and innovative sensor technology.

Paper Details

Date Published: 6 May 2004
PDF: 7 pages
Proc. SPIE 5368, Medical Imaging 2004: Physics of Medical Imaging, (6 May 2004); doi: 10.1117/12.534010
Show Author Affiliations
Tatsuya Yamazaki, Canon Inc. (Japan)
Tomoyuki Tamura, Canon Inc. (Japan)
Makoto Nokita, Canon Inc. (Japan)
Satoshi Okada, Canon Inc. (Japan)
Shinsuke Hayashida, Canon Inc. (Japan)
Yoshihiro Ogawa, Canon Inc. (Japan)

Published in SPIE Proceedings Vol. 5368:
Medical Imaging 2004: Physics of Medical Imaging
Martin J. Yaffe; Michael J. Flynn, Editor(s)

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