Fully digitalized triple-energy x-ray computed tomography with high spatial resolutions using beam hardening

Author:

Ito Kazuki1ORCID,Sato Eiichi123ORCID,Moriyama Hodaka1,Hagiwara Osahiko1,Enomoto Toshiyuki1,Yoshida Sohei3,Watanabe Manabu1ORCID

Affiliation:

1. Department of Surgery, Toho University Ohashi Medical Center 1 , 2-22-36 Ohashi, Meguro, Tokyo 153-8515, Japan

2. Honorary of Physics, Iwate Medical University 2 , 2-14-6 Kawaramachi, Wakabayashi, Sendai, Miyagi 984-0816, Japan

3. Department of Radiology, School of Medicine, Iwate Medical University 3 , 2-1-1 Idaidori, Yahaba, Iwate 028-3694, Japan

Abstract

To regulate the effective photon energy with a constant tube voltage and to perform enhanced K-edge x-ray imaging, we built a prototype fully digitalized triple-energy x-ray computed tomography (TECT) scanner utilizing beam hardening. An object on the turntable is irradiated by a 0.1-mm-focus x-ray tube at 1.4-time-magnification. 720 raw radiograms are obtained using a flat panel detector, and 512 tomograms are reconstructed. With an increasing digital amplification factor, the gray raw-density projections obtained using low-energy-photon absorption disappeared at a constant maximum raw density, and the effective energy was increased by x-ray beam hardening. TECT was performed at digital amplifier factors below 3.0, and the effective energy increased with increasing amplification factors. In particular, fine blood vessels were visible using gadolinium-K-edge CT.

Funder

Ministry of Education, Culture, Sports, Science and Technology

Publisher

AIP Publishing

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