中国物理B ›› 2020, Vol. 29 ›› Issue (6): 68703-068703.doi: 10.1088/1674-1056/ab8887
• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇 下一篇
Jianlin Xia(夏健霖), Wen Xu(徐文), Ruicheng Zhou(周瑞成), Xiaomin Shi(石晓敏), Kun Ren(任坤), Heng Chen(陈恒), Zhili Wang(王志立)
Jianlin Xia(夏健霖), Wen Xu(徐文), Ruicheng Zhou(周瑞成), Xiaomin Shi(石晓敏), Kun Ren(任坤), Heng Chen(陈恒), Zhili Wang(王志立)
摘要: Recently, a novel three-image algorithm has been proposed to retrieve the sample's absorption, refraction, and scattering properties in x-ray analyzer-based imaging. The feasibility of the three-image algorithm was validated by synchrotron radiation experiments. However, it is unclear yet whether the estimated refraction and scattering signals are biased or not and how the analyzer angular position affects the biases in the estimated signals. For this purpose, the biases of the extracted refraction and scattering signals are theoretically derived for the three-image algorithm. The theoretical models are further confirmed by numerical experiments. The results show that both the estimated refraction and scattering signals are biased, and the biases are strongly dependent on the analyzer angular position. Besides, the biases also show dependence on the sample's refraction and scattering properties locally. Those results can be used as general guidelines to optimize experimental parameters for bias reduction and accurate imaging of different features within the sample.
中图分类号: (X-ray imaging)