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Proceedings Paper

Dark-count-less x-ray photon counting using an LSO-MPPC detector and its application to computed tomography
Author(s): Eiichi Sato; Yasuyuki Oda; Hajime Kodama; Osahiko Hagiwara; Hiroshi Matsukiyo; Akihiro Osawa; Toshiyuki Enomoto; Manabu Watanabe; Shinya Kusachi; Shigehiro Sato; Akira Ogawa
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Paper Abstract

X-ray photons are detected using an Lu2(SiO4)O [LSO] single-crystal scintillator with a decay time of 40 ns and a multipixel photon counter (MPPC). The photocurrent from the MPPC is amplified by a high-speed current-voltage amplifier with an 80 MHz-gain-band operational amplifier, and the 200-ns-width event pulses are sent to a multichannel analyzer to measure X-ray spectra. The MPPC is driven in the pre-Geiger mode at a bias voltage of 70.7 V and a temperature of 23°C. Photon-counting computed tomography (PC-CT) is accomplished by repeated linear scans and rotations of an object, and projection curves of the object are obtained by linear scanning. The exposure time for obtaining a tomogram was 10 min with scan steps of 0.5 mm and rotation steps of 1.0°. At a tube voltage of 100 kV, the maximum count rate was 350 kcps/pixel. We carried out PC-CT using gadolinium media and confirmed the energydispersive effect with changes in the lower level voltage of event pulses using a comparator.

Paper Details

Date Published: 26 September 2013
PDF: 5 pages
Proc. SPIE 8853, Medical Applications of Radiation Detectors III, 885302 (26 September 2013); doi: 10.1117/12.2025358
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Yasuyuki Oda, Iwate Medical Univ. (Japan)
Hajime Kodama, Toho Univ. School of Medicine (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)

Published in SPIE Proceedings Vol. 8853:
Medical Applications of Radiation Detectors III
H. Bradford Barber; Hans Roehrig, Editor(s)

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