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Proceedings Paper

Dark-count-less photon-counting x-ray computed tomography system using a YAP-MPPC detector
Author(s): Eiichi Sato; Yuich Sato; Abulajiang Abudurexiti; Osahiko Hagiwara; Hiroshi Matsukiyo; Akihiro Osawa; Toshiyuki Enomoto; Manabu Watanabe; Shinya Kusachi; Shigehiro Sato; Akira Ogawa; Jun Onagawa
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Paper Abstract

A high-sensitive X-ray computed tomography (CT) system is useful for decreasing absorbed dose for patients, and a dark-count-less photon-counting CT system was developed. X-ray photons are detected using a YAP(Ce) [cerium-doped yttrium aluminum perovskite] single crystal scintillator and an MPPC (multipixel photon counter). Photocurrents are amplified by a high-speed current-voltage amplifier, and smooth event pulses from an integrator are sent to a high-speed comparator. Then, logical pulses are produced from the comparator and are counted by a counter card. Tomography is accomplished by repeated linear scans and rotations of an object, and projection curves of the object are obtained by the linear scan. The image contrast of gadolinium medium slightly fell with increase in lower-level voltage (Vl) of the comparator. The dark count rate was 0 cps, and the count rate for the CT was approximately 250 kcps.

Paper Details

Date Published: 17 October 2012
PDF: 6 pages
Proc. SPIE 8508, Medical Applications of Radiation Detectors II, 850807 (17 October 2012); doi: 10.1117/12.929176
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Yuich Sato, Iwate Medical Univ. (Japan)
Abulajiang Abudurexiti, Iwate Medical Univ. (Japan)
Osahiko Hagiwara, Toho Univ. School of Medicine (Japan)
Hiroshi Matsukiyo, Toho Univ. School of Medicine (Japan)
Akihiro Osawa, Toho Univ. School of Medicine (Japan)
Toshiyuki Enomoto, Toho Univ. School of Medicine (Japan)
Manabu Watanabe, Toho Univ. School of Medicine (Japan)
Shinya Kusachi, Toho Univ. School of Medicine (Japan)
Shigehiro Sato, Iwate Medical Univ. (Japan)
Akira Ogawa, Iwate Medical Univ. (Japan)
Jun Onagawa, Tohoku Gakuin Univ. (Japan)

Published in SPIE Proceedings Vol. 8508:
Medical Applications of Radiation Detectors II
H. Bradford Barber; Hans Roehrig, Editor(s)

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