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J Synchrotron Radiat. 2017 Mar 1;24(Pt 2):490-497. doi: 10.1107/S160057751700100X. Epub 2017 Feb 16.

A modified equally sloped algorithm based on the total variation algorithm in computed tomography for insufficient data.

Author information

1
National Synchrotion Radiation Laboratory, University of Science and Technology of China, 3#222, 42 Hezuohua South Road, Hefei, Anhui 230026, People's Republic of China.

Abstract

Computed tomography (CT) has become an important technique for analyzing the inner structures of material, biological and energy fields. However, there are often challenges in the practical application of CT due to insufficient data. For example, the maximum rotation angle of the sample stage is limited by sample space or image reconstruction from the limited number of views required to reduce the X-ray dose delivered to the sample. Therefore, it is difficult to acquire CT images with complete data. In this work, an iterative reconstruction algorithm based on the minimization of the image total variation (TV) has been utilized to develop equally sloped tomography (EST), and the reconstruction was carried out from limited-angle, few-view and noisy data. A synchrotron CT experiment on hydroxyapatite was also carried out to demonstrate the ability of the TV-EST algorithm. The results indicated that the new TV-EST algorithm was capable of achieving high-quality reconstructions from projections with insufficient data.

KEYWORDS:

computed tomography; equally sloped tomography; few-view; limited-angle; noisy data; total variation minimization

PMID:
28244445
DOI:
10.1107/S160057751700100X

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