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17 October 2012 Dark-count-less photon-counting x-ray computed tomography system using a YAP-MPPC detector
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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Proceedings Volume 8508, Medical Applications of Radiation Detectors II; 850807 (2012) https://doi.org/10.1117/12.929176
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States
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.
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Eiichi Sato, Yuich Sato, Abulajiang Abudurexiti, Osahiko Hagiwara, Hiroshi Matsukiyo, Akihiro Osawa, Toshiyuki Enomoto, Manabu Watanabe, Shinya Kusachi, Shigehiro Sato, Akira Ogawa, and Jun Onagawa "Dark-count-less photon-counting x-ray computed tomography system using a YAP-MPPC detector", Proc. SPIE 8508, Medical Applications of Radiation Detectors II, 850807 (17 October 2012); https://doi.org/10.1117/12.929176
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KEYWORDS
Sensors
X-rays
Gadolinium
Amplifiers
X-ray computed tomography
Computing systems
Photon counting
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