Dr. Zhijun Chi Profile

Dr. Zhijun Chi

at Beijing Normal University

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Proceedings Article | 27 March 2022 Paper

K-edge imaging based on a Thomson scattering x-ray source

Zhijun Chi, Yingchao Du, Lixin Yan, Hongze Zhang, Wenhui Huang, Chuanxiang Tang

Proceedings Volume 12169, 121691A (2022) https://doi.org/10.1117/12.2622201

KEYWORDS: X-rays, X-ray imaging, Thomson scattering, X-ray sources, Light sources

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A Thomson scattering X-ray source can produce quasi-monochromatic and continuously energy-tunable X-rays characterized by small focal spot and high brightness, which makes it an excellent light source for K-edge imaging. In this paper, the experimental feasibility of K-edge imaging was demonstrated at the Tsinghua Thomson scattering X-ray source (TTX). The phantom was a plastic test tube filled with sodium iodide (NaI)- loaded water solutions with I concentrations ranging from 5 to 300 mg/ml. Well agreement between the measured equivalent projection integral of the linear attenuation coefficient of the phantom and the theoretically predicted value was witnessed. The influence of X-ray bandwidth on the image quality was discussed. Based on the continuous tunability of scattered X-ray energy, the K-edge subtraction imaging was tested and obvious contrast enhancement was achieved. Our results pave the way towards practical application of K-edge imaging at the TTX.

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