Experimental evaluation of a-Se and CdTe flat-panel x-ray detectors for digital radiography and fluoroscopy

Susumu Adachi; Naoyuki Hori; Kenji Sato; Satoshi Tokuda; Toshiyuki Sato; Kazuhiro Uehara; Yoshihiro Izumi; Hisashi Nagata; Youji Yoshimura; Satoshi Yamada

doi:10.1117/12.384511

25 April 2000 Experimental evaluation of a-Se and CdTe flat-panel x-ray detectors for digital radiography and fluoroscopy

Susumu Adachi, Naoyuki Hori, Kenji Sato, Satoshi Tokuda, Toshiyuki Sato, Kazuhiro Uehara, Yoshihiro Izumi, Hisashi Nagata, Youji Yoshimura, Satoshi Yamada

Author Affiliations +

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384511
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

Described are two types of direct-detection flat-panel X-ray detectors utilizing amorphous selenium (a-Se) and cadmium telluride (CdTe). The a-Se detector is fabricated using direct deposition onto a thin film transistor (TFT) substrate, whereas the CdTe detector is fabricated using a novel hybrid method, in which CdTe is pre-deposited onto a glass substrate and then connected to a TFT substrate. The detector array format is 512 X 512 with a pixel pitch of 150 micrometer. The imaging properties of both detectors have been evaluated with respect to X-ray sensitivity, lag, spatial resolution, and detective quantum efficiency (DQE). The modulation transfer functions (MTFs) measured at 1 lp/mm were 0.96 for a- Se and 0.65 for CdTe. The imaging lags after 33 ms were about 4% for a-Se and 22% for CdTe. The DQE values measured at zero spatial frequency were 0.75 for a-Se and 0.22 for CdTe. The results indicate that the a-Se and CdTe detectors have high potential as new digital X-ray imaging devices for both radiography and fluoroscopy.

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Susumu Adachi, Naoyuki Hori, Kenji Sato, Satoshi Tokuda, Toshiyuki Sato, Kazuhiro Uehara, Yoshihiro Izumi, Hisashi Nagata, Youji Yoshimura, and Satoshi Yamada "Experimental evaluation of a-Se and CdTe flat-panel x-ray detectors for digital radiography and fluoroscopy", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384511

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