Principle of diffraction enhanced imaging(DEI) and computed tomography based on DEI method

In the first part of this article a more general DEI equation was derived using simple concepts. Not only does the new DEI equation explain all the problems that can be done by the DEI equation proposed by Chapman, but also explains the problem that can not be explained with the old DEI equation, such as the noise background caused by the small angle scattering reflected by the analyzer. In the second part, a DEI-PI-CT formula has been proposed and the contour contrast caused by the extinction of refraction beam has been qualitatively explained, and then based on the work of Ando's group two formulae of refraction CT with DEI method has been proposed. Combining one refraction CT formula proposed by Dilmanian with the two refraction CT formulae proposed by us, the whole framework of CT algorithm can be made to reconstruct three components of the gradient of refractive index.

作 者： ZHU Pei-Ping HUANG Wan-Xia YUAN Qing-Xi YU Jian WANG Jun-Yue ZHENG Xin SHU Hang CHEN Bo LIU Yi-Jin LI En-Rong WU Zi-Yu   作者單位： ZHU Pei-Ping,HUANG Wan-Xia,YUAN Qing-Xi,WANG Jun-Yue,ZHENG Xin,SHU Hang,CHEN Bo,LIU Yi-Jin,LI En-Rong,WU Zi-Yu(Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China)

YU Jian(Electronic Institute of Dalian University of Technology, Dalian 116023, China) 

刊 名： 核技術(shù)（英文版）  SCI 英文刊名： NUCLEAR SCIENCE AND TECHNIQUES  年，卷(期)： 2006 17(6)  分類號(hào)： O57  關(guān)鍵詞： Diffraction enhanced imaging   Refraction computed tomography   Synchrotron radiation  

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