A new method for information retrieval in two-dimensional grating-based X-ray phase contrast imaging |
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| Authors: | Wang Zhi-Li a Gao Kun a Chen Jian a Ge Xin a Zhu Pei-Ping b Tian Yang-Chao a and Wu Zi-Yu |
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| Affiliation: | 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 with 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 reverseprojection(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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| Keywords: | X-ray imaging phase contrast information retrieval shifting curve |
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