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Proceedings Paper

High-speed photon-counting x-ray computed tomography system utilizing a multipixel photon counter
Author(s): Eiichi Sato; Toshiyuki Enomoto; Manabu Watanabe; Keitaro Hitomi; Kiyomi Takahashi; Shigehiro Sato; Akiro Ogawa; Jun Onagawa
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Paper Abstract

High-speed photon counting is useful for discriminating photon energy and for decreasing absorbed dose for patients in medical radiography, and the counting is usable for constructing an x-ray computed tomography (CT) system. A photon-counting x-ray CT system is of the first generation type and consists of an x-ray generator, a turn table, a translation stage, a two-stage controller, a multipixel photon counter (MPPC) module, a 1.0-mm-thick LSO crystal (scintillator), a counter card (CC), and a personal computer (PC). Tomography is accomplished by repeating the linear scanning and the rotation of an object, and projection curves of the object are obtained by the linear scanning using the detector consisting of a MPPC module and the LSO. The pulses of the event signal from the module are counted by the CC in conjunction with the PC. The lower level of the photon energy is roughly determined by a comparator circuit in the module, and the unit of the level is the photon equivalent (pe). Thus, the average photon energy of the x-ray spectra increases with increasing the lower-level voltage of the comparator. The maximum count rate was approximately 20 Mcps, and energy-discriminated CT was roughly carried out.

Paper Details

Date Published: 5 August 2009
PDF: 7 pages
Proc. SPIE 7385, International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications, 738525 (5 August 2009); doi: 10.1117/12.836012
Show Author Affiliations
Eiichi Sato, Iwate Medical Univ. (Japan)
Toshiyuki Enomoto, Tohu Univ. School of Medicine (Japan)
Manabu Watanabe, Tohu Univ. School of Medicine (Japan)
Keitaro Hitomi, Tohoku Institute of Technology (China)
Kiyomi Takahashi, Iwate Medical Univ. (Japan)
Shigehiro Sato, Iwate Medical Univ. (Japan)
Akiro Ogawa, Iwate Medical Univ. (Japan)
Jun Onagawa, Tohoku Gakuin Univ. (Japan)


Published in SPIE Proceedings Vol. 7385:
International Symposium on Photoelectronic Detection and Imaging 2009: Terahertz and High Energy Radiation Detection Technologies and Applications

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