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Photon-counting x-ray computed tomography using a YAP(Ce)-PMT detector and beam hardening
Author(s): Manabu Watanabe; Eiichi Sato; Sohei Yoshida; Kunihiro Yoshioka; Yasuyuki Oda; Hodaka Moriyama; Osahiko Hagiwara; Toshiyuki Enomoto
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Paper Abstract

To realize novel photon-counting energy-dispersive X-ray computed tomography (CT), we have developed a low-dose CT scanner using a detector consisting of a cerium-doped yttrium aluminum perovskite [YAP(Ce)] crystal and a small photomultiplier tube (PMT). X-ray photons are absorbed by the YAP(Ce) crystal, and negative outputs are produced from the PMT. The PMT outputs are amplified by an inverse voltage-to-voltage amplifier, and the event pulses are counted by the counter with a low threshold energy of 20 keV. First, almost all the photons are counted without the photon-energy dependence, since the scintillation-photon number produced by one X-ray photon is proportional to the photon energy. Second, the energy-dispersive imaging is performed using the self-beam hardening by the object. The maximum photon count of the projection data is determined after the air absorption, and the effective photon energy increases with increasing digital-amplification factor at the constant maximum count. In the triple-energy CT, the X-ray beam diameter was 0.5 mm, and the spatial resolutions were approximately 0.3×0.3 mm2 . The exposure time for DE-CT was 9.8 min at a total rotation angle of 180°.

Paper Details

Date Published: 9 September 2019
PDF: 6 pages
Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 111141D (9 September 2019); doi: 10.1117/12.2530767
Show Author Affiliations
Manabu Watanabe, Toho Univ. (Japan)
Eiichi Sato, Iwate Medical Univ. (Japan)
Sohei Yoshida, Iwate Medical Univ. (Japan)
Kunihiro Yoshioka, Iwate Medical Univ. (Japan)
Yasuyuki Oda, Iwate Medical Univ. (Japan)
Hodaka Moriyama, Toho Univ. (Japan)
Osahiko Hagiwara, Toho Univ. (Japan)
Toshiyuki Enomoto, Toho Univ. (Japan)


Published in SPIE Proceedings Vol. 11114:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI
Ralph B. James; Arnold Burger; Stephen A. Payne, Editor(s)

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