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论文类型：期刊论文

发表时间：2012-06-01

发表刊物：OPTICS COMMUNICATIONS

收录刊物：SCIE、EI、Scopus

卷号：285

期号：12

页面范围：2972-2975

ISSN号：0030-4018

关键字：Phase contrast computed tomography; Diffraction enhanced imaging; Tikhonov regularization

摘要：A number of reconstruction algorithms for differential phase-contrast computed tomography reconstruct the refractive index decrement using the refraction angles of X-rays. However, these approaches require that the refraction angle at each view be extracted from several raw images captured at the same view, leading to unacceptably long exposure times and huge X-ray doses. We develop an iterative reconstruction algorithm to reconstruct the complex refractive index from raw images gathered only once at each view angle. Using the Tikhonov regularization method as basis, we simultaneously obtain the refractive index decrement and attenuation coefficient by minimizing the cost function. The experimental results show that the proposed algorithm effectively yields reconstructed images of low noise level. (C) 2012 Elsevier B.V. All rights reserved.