Reconstruction of the refractive index gradient by x-ray diffraction enhanced computed tomography

doi:10.1088/0031-9155/51/14/007

Reconstruction of the refractive index gradient by x-ray diffraction enhanced computed tomography

Junyue Wang et al 2006 Phys. Med. Biol. 51 3391-3396 doi: 10.1088/0031-9155/51/14/007

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Junyue Wang^1,2, Peiping Zhu¹, Qingxi Yuan¹, Wanxia Huang¹, Hang Shu^1,2, Bo Chen⁴, Tiandou Hu¹ and Ziyu Wu^1,3
¹ Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China
² Graduate School of the Chinese Academy of Sciences, Beijing 100864, People's Republic of China
³ National Center for NanoScience and Technology, Beijing 100080, People's Republic of China
⁴ Department of Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
E-mail: wuzy@ihep.ac.cn and zhupp@ihep.ac.cn

Abstract. The computed tomography technique cannot easily be extended to diffraction enhanced imaging (DEI) because, while from DEI we may extract the refractive index gradient in one dimension, from the conventional CT reconstruction algorithm we may reconstruct only a scalar quantity. However, recently we showed that changing the direction of the scan axis, and collecting a set of data related to the three-dimensional distribution of the refractive index gradient of the sample, a CT image was obtained. The algorithm we used is based on the conventional CT algorithm but with a specific pre-processing of the projection data. The mathematical framework of the procedure and a simple CT experiment are presented and discussed.

Print publication: Issue 14 (21 July 2006)
Received 22 March 2006, in final form 11 May 2006
Published 23 June 2006

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Reconstruction of the refractive index gradient by x-ray diffraction enhanced computed tomography

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