Photon-counting x-ray computed tomography using a YAP(Ce)-PMT detector and beam hardening

Manabu Watanabe; Eiichi Sato; Sohei Yoshida; Kunihiro Yoshioka; Yasuyuki Oda; Hodaka Moriyama; Osahiko Hagiwara; Toshiyuki Enomoto

doi:10.1117/12.2530767

9 September 2019 Photon-counting x-ray computed tomography using a YAP(Ce)-PMT detector and beam hardening

Manabu Watanabe, Eiichi Sato, Sohei Yoshida, Kunihiro Yoshioka, Yasuyuki Oda, Hodaka Moriyama, Osahiko Hagiwara, Toshiyuki Enomoto

Author Affiliations +

Proceedings Volume 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI; 111141D (2019) https://doi.org/10.1117/12.2530767
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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°.

Conference Presentation

Citation Download Citation

Manabu Watanabe, Eiichi Sato, Sohei Yoshida, Kunihiro Yoshioka, Yasuyuki Oda, Hodaka Moriyama, Osahiko Hagiwara, and Toshiyuki Enomoto "Photon-counting x-ray computed tomography using a YAP(Ce)-PMT detector and beam hardening", Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 111141D (9 September 2019); https://doi.org/10.1117/12.2530767

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available