High-speed dual-energy x-ray photon counter Using a YAP(Ce)-Photomultiplier detector and its application to low-dose computed tomography

Yuichi Sato; Eiichi Sato; Yasuyuki Oda; Hodaka Moriyama; Osahiko Hagiwara; Hiroshi Matsukiyo; Toshiyuki Enomoto; Manabu Watanabe; Shinya Kusachi

doi:10.1117/12.2524632

28 January 2019 High-speed dual-energy x-ray photon counter Using a YAP(Ce)-Photomultiplier detector and its application to low-dose computed tomography

Yuichi Sato, Eiichi Sato, Yasuyuki Oda, Hodaka Moriyama, Osahiko Hagiwara, Hiroshi Matsukiyo, Toshiyuki Enomoto, Manabu Watanabe, Shinya Kusachi

Author Affiliations +

Proceedings Volume 11051, 32nd International Congress on High-Speed Imaging and Photonics; 110510I (2019) https://doi.org/10.1117/12.2524632
Event: International Conference on High-Speed Imaging and Photonics 2018, 2018, Enschede, The Netherlands

Abstract

We have constructed a dual-energy (DE) high-speed 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. X-ray photons are detected using a YAP(Ce)-PMT detector, and the negative output pulses from the PMT are input to the inverse amplifier. The 400-ns-width amplifier-output pulses are sent to the pulse-width extender to measure the pulse height correctly. The event pulses from the extender are sent to the DE counter. 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 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. The tube voltage and the maximum current were 100 kV and 0.60 mA, respectively. The energy range and region for iodine- and gadolinium-K-edge CT are 35-60 and beyond 50 keV (50-100 keV), respectively. The maximum count rate of DE-CT was 80 kilocounts per second, and the exposure time for tomography was 19.6 min at a total rotation angle of 360°.

Citation Download Citation

Yuichi Sato, Eiichi Sato, Yasuyuki Oda, Hodaka Moriyama, Osahiko Hagiwara, Hiroshi Matsukiyo, Toshiyuki Enomoto, Manabu Watanabe, and Shinya Kusachi "High-speed dual-energy x-ray photon counter Using a YAP(Ce)-Photomultiplier detector and its application to low-dose computed tomography", Proc. SPIE 11051, 32nd International Congress on High-Speed Imaging and Photonics, 110510I (28 January 2019); https://doi.org/10.1117/12.2524632

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