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Chin. Phys. B, 2016, Vol. 25(7): 078701    DOI: 10.1088/1674-1056/25/7/078701
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Optimization-based image reconstruction in x-ray computed tomography by sparsity exploitation of local continuity and nonlocal spatial self-similarity

Han-Ming Zhang(张瀚铭), Lin-Yuan Wang(王林元), Lei Li(李磊), Bin Yan(闫镔), Ai-Long Cai(蔡爱龙), Guo-En Hu(胡国恩)
National Digital Switching System Engineering and Technological Research Center, Zhengzhou 450002, China
Abstract  The additional sparse prior of images has been the subject of much research in problems of sparse-view computed tomography (CT) reconstruction. A method employing the image gradient sparsity is often used to reduce the sampling rate and is shown to remove the unwanted artifacts while preserve sharp edges, but may cause blocky or patchy artifacts. To eliminate this drawback, we propose a novel sparsity exploitation-based model for CT image reconstruction. In the presented model, the sparse representation and sparsity exploitation of both gradient and nonlocal gradient are investigated. The new model is shown to offer the potential for better results by introducing a similarity prior information of the image structure. Then, an effective alternating direction minimization algorithm is developed to optimize the objective function with a robust convergence result. Qualitative and quantitative evaluations have been carried out both on the simulation and real data in terms of accuracy and resolution properties. The results indicate that the proposed method can be applied for achieving better image-quality potential with the theoretically expected detailed feature preservation.
Keywords:  computed tomography      image reconstruction      sparsity exploitation      nonlocal gradient  
Received:  29 December 2015      Revised:  26 February 2016      Published:  05 July 2016
PACS:  87.59.-e (X-ray imaging)  
  07.85.-m (X- and γ-ray instruments)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61372172).
Corresponding Authors:  Bin Yan     E-mail:  ybspace@hotmail.com

Cite this article: 

Han-Ming Zhang(张瀚铭), Lin-Yuan Wang(王林元), Lei Li(李磊), Bin Yan(闫镔), Ai-Long Cai(蔡爱龙), Guo-En Hu(胡国恩) Optimization-based image reconstruction in x-ray computed tomography by sparsity exploitation of local continuity and nonlocal spatial self-similarity 2016 Chin. Phys. B 25 078701

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