INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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A new method for information retrieval in two-dimensional grating-based X-ray phase contrast imaging |
Wang Zhi-Li (王志立)a, Gao Kun (高昆)a, Chen Jian (陈健)a, Ge Xin (葛昕)a, Zhu Pei-Ping (朱佩平)b, Tian Yang-Chao (田扬超)a, Wu Zi-Yu (吴自玉 )a b |
a National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China; b Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Grating-based X-ray phase contrast imaging has been demonstrated to be an extremely powerful phase-sensitive imaging technique. By using two-dimensional (2D) gratings, the observable contrast is extended to two refraction directions. Recently, we have developed a novel reverse-projection (RP) method, which is capable of retrieving the object information efficiently in one-dimensional (1D) grating-based phase contrast imaging. In this contribution, we present its extension to the 2D grating-based X-ray phase contrast imaging, named the two-dimensional reverse-projection (2D-RP) method, for information retrieval. The method takes into account the nonlinear contributions of two refraction directions and allows the retrieval of the absorption, the horizontal and the vertical refraction images. The obtained information can be used for the reconstruction of the three-dimensional phase gradient field, and for an improved phase map retrieval and reconstruction. Numerical experiments are carried out, and the results confirm the validity of the 2D-RP method.
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Received: 30 March 2012
Revised: 01 June 2012
Accepted manuscript online:
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PACS:
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87.59.-e
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(X-ray imaging)
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87.64.mh
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(Phase contrast and DIC)
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42.30.Rx
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(Phase retrieval)
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Fund: Project supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KJCX2-YW-N42), the Key Project of the National Natural Science Foundation of China (Grant No. 10734070), the National Natural Science Foundation of China (Grant No. 11205157), the National Basic Research Program of China (Grant Nos. 2009CB930804 and 2012CB825800), the Fundamental Research Funds for the Central Universities, China (Grant No. WK2310000021), and the China Postdoctoral Science Foundation (Grant No. 2011M501064). |
Corresponding Authors:
Wu Zi-Yu
E-mail: wuzy@ustc.edu.cn
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Cite this article:
Wang Zhi-Li (王志立), Gao Kun (高昆), Chen Jian (陈健), Ge Xin (葛昕), Zhu Pei-Ping (朱佩平), Tian Yang-Chao (田扬超), Wu Zi-Yu (吴自玉 ) A new method for information retrieval in two-dimensional grating-based X-ray phase contrast imaging 2012 Chin. Phys. B 21 118703
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