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Proceedings Paper

High-speed dual-energy x-ray photon counter Using a YAP(Ce)-Photomultiplier detector and its application to low-dose computed tomography
Author(s): Yuichi Sato; Eiichi Sato; Yasuyuki Oda; Hodaka Moriyama; Osahiko Hagiwara; Hiroshi Matsukiyo; Toshiyuki Enomoto; Manabu Watanabe; Shinya Kusachi
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Paper 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°.

Paper Details

Date Published: 28 January 2019
PDF: 7 pages
Proc. SPIE 11051, 32nd International Congress on High-Speed Imaging and Photonics, 110510I (28 January 2019); doi: 10.1117/12.2524632
Show Author Affiliations
Yuichi Sato, Iwate Medical Univ. Hospital (Japan)
Eiichi Sato, Iwate Medical Univ. (Japan)
Yasuyuki Oda, Iwate Medical Univ. (Japan)
Hodaka Moriyama, Toho Univ. Ohashi Medical Ctr. (Japan)
Osahiko Hagiwara, Toho Univ. Ohashi Medical Ctr. (Japan)
Hiroshi Matsukiyo, Toho Univ. Ohashi Medical Ctr. (Japan)
Toshiyuki Enomoto, Toho Univ. Ohashi Medical Ctr. (Japan)
Manabu Watanabe, Toho Univ. Ohashi Medical Ctr. (Japan)
Shinya Kusachi, Toho Univ. Ohashi Medical Ctr. (Japan)

Published in SPIE Proceedings Vol. 11051:
32nd International Congress on High-Speed Imaging and Photonics
Michel Versluis; Eleanor Stride, Editor(s)

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