A modified discrete algebraic reconstruction technique for multiple grey image reconstruction for limited angle range tomography

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• 作者：Zhiting Liang ; Yong Guan ; Gang Liu ; Xiangyu Chen ; Fahu Li ; Pengfei Guo and Yangchao Tian
• 关键词：modified discrete algebraic reconstruction technique (MDART) ; multiple grey image ; image reconstruction ; limited-angle range
• 刊名：Journal of Synchrotron Radiation
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：23
• 期：2
• 页码：606-616
• 全文大小：2832K
• ISSN：1600-5775

文摘

The `missing wedge', which is due to a restricted rotation range, is a major challenge for quantitative analysis of an object using tomography. With prior knowledge of the grey levels, the discrete algebraic reconstruction technique (DART) is able to reconstruct objects accurately with projections in a limited angle range. However, the quality of the reconstructions declines as the number of grey levels increases. In this paper, a modified DART (MDART) was proposed, in which each independent region of homogeneous material was chosen as a research object, instead of the grey values. The grey values of each discrete region were estimated according to the solution of the linear projection equations. The iterative process of boundary pixels updating and correcting the grey values of each region was executed alternately. Simulation experiments of binary phantoms as well as multiple grey phantoms show that MDART is capable of achieving high-quality reconstructions with projections in a limited angle range. The interesting advancement of MDART is that neither prior knowledge of the grey values nor the number of grey levels is necessary.