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Investigation of low-dose energy-dispersive x -ray computed tomography utilizing beam hardening
Author(s): Sohei Yoshida; Eiichi Sato; Yasuyuki Oda; Kunihiro Yoshioka; Shigeru Ehara; Hodaka Moriyama; Osahiko Hagiwara; Toshiyuki Enomoto; Manabu Watanabe
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Paper Abstract

To realize novel energy-dispersive X-ray computed tomography (CT) and to reduce the incident dose for the object, we have developed a low-dose low-scattering CT scanner with high spatial resolutions using a room-temperature cadmium telluride (CdTe) detector. X-ray photons are absorbed by the CdTe crystal, and the electric charges flowing through the CdTe crystal are amplified using a current-to-voltage and voltage-to-voltage amplifiers. The first-generation CT is accomplished by repeated translations by the detector and rotations of the object, and the effective photon energy increases with increasing amplification factor of the digital amplifier at a constant maximum output voltage of 5.0 V. The tripleenergy computed tomography (TE-CT) is performed utilizing the beam hardening by the object. In the TE-CT, the scattering photon count is reduced using a 0.5-mm-diam pinhole behind the object, and the spatial resolution is improved by a 0.25-mm-diam pinhole. The exposure time for TE-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, 111141H (9 September 2019); doi: 10.1117/12.2529663
Show Author Affiliations
Sohei Yoshida, Iwate Medical Univ. (Japan)
Eiichi Sato, Iwate Medical Univ. (Japan)
Yasuyuki Oda, Iwate Medical Univ. (Japan)
Kunihiro Yoshioka, Iwate Medical Univ. (Japan)
Shigeru Ehara, Iwate Medical Univ. (Japan)
Hodaka Moriyama, Toho Univ. (Japan)
Osahiko Hagiwara, Toho Univ. (Japan)
Toshiyuki Enomoto, Toho Univ. (Japan)
Manabu Watanabe, 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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