Searching for just a few words should be enough to get started. If you need to make more complex queries, use the tips below to guide you.
Article type: Research Article
Authors: Niu, Shanzhoua; b | Huang, Jingb | Bian, Zhaoyingb | Zeng, Dongb | Chen, Wufanb | Yu, Gaohanga; * | Liang, Zhengrongc | Ma, Jianhuab; *
Affiliations: [a] School of Mathematics and Computer Science, Gannan Normal University, Ganzhou, China | [b] School of Biomedical Engineering, Southern Medical University, Guangzhou, China | [c] Department of Radiology, State University of New York, Stony Brook, NY, USA
Correspondence: [*] Corresponding authors: Gaohang Yu, School of Mathematics and Computer Science, Gannan Normal University, Ganzhou, Jiangxi 341000, China. Tel./Fax: +86 0797 8393663; E-mail: maghyu@163.com and Jianhua Ma, School of Biomedical Engineering, Southern Medical University, Guangzhou, Guangdong 510515, China. Tel./Fax: +86 20 61648285; E-mail: jhma@smu.edu.cn.
Abstract: BCKGROUND:Accurate statistical model of the measured projection data is essential for computed tomography (CT) image reconstruction. The transmission data can be described by a compound Poisson distribution upon an electronic noise background. However, such a statistical distribution is numerically intractable for image reconstruction. OBJECTIVE:Although the sinogram data is easily manipulated, it lacks a statistical description for image reconstruction. To address this problem, we present an alpha-divergence constrained total generalized variation (AD-TGV) method for sparse-view x-ray CT image reconstruction. METHODS:The AD-TGV method is formulated as an optimization problem, which balances the alpha-divergence (AD) fidelity and total generalized variation (TGV) regularization in one framework. The alpha-divergence is used to measure the discrepancy between the measured and estimated projection data. The TGV regularization can effectively eliminate the staircase and patchy artifacts which is often observed in total variation (TV) regularization. A modified proximal forward-backward splitting algorithm was proposed to minimize the associated objective function. RESULTS:Qualitative and quantitative evaluations were carried out on both phantom and patient data. Compared with the original TV-based method, the evaluations clearly demonstrate that the AD-TGV method achieves higher accuracy and lower noise, while preserving structural details. CONCLUSIONS:The experimental results show that the presented AD-TGV method can achieve more gains over the AD-TV method in preserving structural details and suppressing image noise and undesired patchy artifacts. The authors can draw the conclusion that the presented AD-TGV method is potential for radiation dose reduction by lowering the milliampere-seconds (mAs) and/or reducing the number of projection views.
Keywords: Sparse-view X-ray CT, iterative reconstruction, alpha-divergence, total generalized variation
DOI: 10.3233/XST-16239
Journal: Journal of X-Ray Science and Technology, vol. 25, no. 4, pp. 673-688, 2017
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
USA
Tel: +1 703 830 6300
Fax: +1 703 830 2300
sales@iospress.com
For editorial issues, like the status of your submitted paper or proposals, write to editorial@iospress.nl
IOS Press
Nieuwe Hemweg 6B
1013 BG Amsterdam
The Netherlands
Tel: +31 20 688 3355
Fax: +31 20 687 0091
info@iospress.nl
For editorial issues, permissions, book requests, submissions and proceedings, contact the Amsterdam office info@iospress.nl
Inspirees International (China Office)
Ciyunsi Beili 207(CapitaLand), Bld 1, 7-901
100025, Beijing
China
Free service line: 400 661 8717
Fax: +86 10 8446 7947
china@iospress.cn
For editorial issues, like the status of your submitted paper or proposals, write to editorial@iospress.nl
如果您在出版方面需要帮助或有任何建, 件至: editorial@iospress.nl