Generalized reverse projection method for grating-based phase tomography

被引:5
|
作者
Wu, Zhao [1 ]
Gao, Kun [1 ]
Wang, Zhili [2 ]
Wang, Shengxiang [3 ]
Zhu, Peiping [3 ]
Ren, Yuqi [4 ]
Tian, Yangchao [1 ]
机构
[1] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China
[2] Hefei Univ Technol, Sch Elect Sci & Appl Phys, Hefei 230009, Anhui, Peoples R China
[3] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
[4] Chinese Acad Sci, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
基金
中国国家自然科学基金;
关键词
X-ray phase contrast; reverse projection; phase retrieval; computed tomography;
D O I
10.1107/S1600577521001806
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
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.
引用
收藏
页码:854 / 863
页数:10
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