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Image reconstruction based on total-variation minimization and alternating direction method in linear scan computed tomography |
Zhang Han-Ming (张瀚铭), Wang Lin-Yuan (王林元), Yan Bin (闫镔), Li Lei (李磊), Xi Xiao-Qi (席晓琦), Lu Li-Zhong (陆利忠) |
National Digital Switching System Engineering and Technological Research Center, Zhengzhou 450002, China |
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Abstract Linear scan computed tomography (LCT) is of great benefit to online industrial scanning and security inspection due to its characteristics of straight-line source trajectory and high scanning speed. However, in practical applications of LCT, there are challenges to image reconstruction due to limited-angle and insufficient data. In this paper, a new reconstruction algorithm based on total-variation (TV) minimization is developed to reconstruct images from limited-angle and insufficient data in LCT. The main idea of our approach is to reformulate a TV problem as a linear equality constrained problem where the objective function is separable, and then minimize its augmented Lagrangian function by using alternating direction method (ADM) to solve subproblems. The proposed method is robust and efficient in the task of reconstruction by showing the convergence of ADM. The numerical simulations and real data reconstructions show that the proposed reconstruction method brings reasonable performance and outperforms some previous ones when applied to an LCT imaging problem.
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Received: 06 September 2012
Revised: 17 December 2012
Accepted manuscript online:
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PACS:
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87.59.-e
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(X-ray imaging)
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07.85.-m
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(X- and γ-ray instruments)
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87.57.Q-
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(Computed tomography)
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Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2012AA011603). |
Corresponding Authors:
Yan Bin
E-mail: ybspace@yahoo.com.cn
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Cite this article:
Zhang Han-Ming (张瀚铭), Wang Lin-Yuan (王林元), Yan Bin (闫镔), Li Lei (李磊), Xi Xiao-Qi (席晓琦), Lu Li-Zhong (陆利忠) Image reconstruction based on total-variation minimization and alternating direction method in linear scan computed tomography 2013 Chin. Phys. B 22 078701
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