Volume 28, Issue 3 pp. 854-863
research papers

Generalized reverse projection method for grating-based phase tomography

Zhao Wu

Corresponding Author

Zhao Wu

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui230029, People's Republic of China

Zhao Wu, e-mail: [email protected]; Yangchao Tian, e-mail: [email protected]Search for more papers by this author
Kun Gao

Kun Gao

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui230029, People's Republic of China

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Zhili Wang

Zhili Wang

School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, Anhui230009, People's Republic of China

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Shengxiang Wang

Shengxiang Wang

Institute of High-Energy Physics, Chinese Academy of Sciences, Beijing100049, People's Republic of China

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Peiping Zhu

Peiping Zhu

Institute of High-Energy Physics, Chinese Academy of Sciences, Beijing100049, People's Republic of China

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Yuqi Ren

Yuqi Ren

Shanghai Synchrotron Radiation Facility, Chinese Academy of Sciences, Shanghai201204, People's Republic of China

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Yangchao Tian

Corresponding Author

Yangchao Tian

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui230029, People's Republic of China

Zhao Wu, e-mail: [email protected]; Yangchao Tian, e-mail: [email protected]Search for more papers by this author
First published: 19 March 2021
Citations: 1

Abstract

The reverse projection protocol results in fast phase-contrast imaging thanks to its compatibility with conventional computed-tomography scanning. Many researchers have proposed variants. However, all these reverse projection methods in grating-based phase-contrast imaging are built on the hypothesis of the synchronous phase of reference shifting curves in the whole field of view. The hypothesis imposes uniformity and alignment requirements on the gratings, thus the field of view is generally limited. In this paper, a generalized reverse projection method is presented analytically for the case of non-uniform reference in grating-based phase tomography. The method is demonstrated by theoretical derivation, numerical simulations and synchrotron radiation experiments. The influence of imaging position to sensitivity, and the phase-wrapping phenomenon are also discussed. The proposed method combines the advantages of the high efficiency of the reverse projection method and the universal applicability of the phase-stepping method. The authors believe that the method would be used widely in fast and dose-constrained imaging.

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