Dual-energy high-count-rate x-ray computed tomography using a cerium-doped yttrium-aluminum-perovskite crystal and a photomultiplier tube

Eiichi Sato; Yasuyuki Oda; Sohei Yoshida; Satoshi Yamaguchi; Yuichi Sato; Hodaka Morioyama; Osahiko Hagiwara; Hiroshi Matsukiyo; Toshiyuki Enomoto; Manabu Watanabe; Shinya Kusachi

doi:10.1117/12.2320174

11 September 2018 Dual-energy high-count-rate x-ray computed tomography using a cerium-doped yttrium-aluminum-perovskite crystal and a photomultiplier tube

Eiichi Sato, Yasuyuki Oda, Sohei Yoshida, Satoshi Yamaguchi, Yuichi Sato, Hodaka Morioyama, Osahiko Hagiwara, Hiroshi Matsukiyo, Toshiyuki Enomoto, Manabu Watanabe, Shinya Kusachi

Author Affiliations +

Proceedings Volume 10763, Radiation Detectors in Medicine, Industry, and National Security XIX; 107630I (2018) https://doi.org/10.1117/12.2320174
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

To perform low-dose low-scattering X-ray computed tomography (CT), we have constructed a dual-energy (DE) X-ray photon counter with a high-count-rate detector system and energy-range and -region selectors. The detector system consists of a cerium-doped yttrium aluminum perovskite [YAP(Ce)] crystal, a small photomultiplier tube (PMT), and an inverse amplifier for the PMT with a pulse-width extender. In DE-CT, both the X-ray source and the detector module are fixed, and the object on the turntable oscillates on the translation stage. A line beam for DE-CT is formed using a two lead (Pb) pinholes in front of the object. The scattering-photon count from the object is reduced using a Pb pinhole behind the object. To improve the spatial resolution, a 0.5-mm-diam Pb pinhole is attached to the YAP(Ce)-PMT detector. X-ray photons are detected using the detector system, and the event pulses are input to the two energy selectors. In DE-CT, the tube voltage and the maximum current were 100 kV and 0.60 mA, respectively. The energy range and region for soft and gadolinium-K-edge CT are 20-40 and beyond 50 keV (50-100 keV), respectively. The maximum count rate of DE-CT was 84 kilocounts per second, and the exposure time for tomography was 19.6 min at a total rotation angle of 360°.

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Eiichi Sato, Yasuyuki Oda, Sohei Yoshida, Satoshi Yamaguchi, Yuichi Sato, Hodaka Morioyama, Osahiko Hagiwara, Hiroshi Matsukiyo, Toshiyuki Enomoto, Manabu Watanabe, and Shinya Kusachi "Dual-energy high-count-rate x-ray computed tomography using a cerium-doped yttrium-aluminum-perovskite crystal and a photomultiplier tube", Proc. SPIE 10763, Radiation Detectors in Medicine, Industry, and National Security XIX, 107630I (11 September 2018); https://doi.org/10.1117/12.2320174

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