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| A Bayesian-MAP Method Based on TV for CT Image Reconstruction from Sparse and Limited Data |
| QI Hong-liang, ZHOU Ling-hong, XU Yuan, HONG Hong |
| School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, China |
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Abstract Computed tomography (CT) plays an important role in the field of modern medical imaging. Reducing radiation exposure dose without significantly decreasing image's quality is always a crucial issue. Inspired by the outstanding performance of total variation (TV) technique in CT image reconstruction, a TV regularization based Bayesian-MAP (MAP-TV) is proposed to reconstruct the case of sparse view projection and limited angle range imaging. This method can suppress the streak artifacts and geometrical deformation while preserving image edges. We used ordered subset (OS) technique to accelerate the reconstruction speed. Numerical results show that MAP-TV is able to reconstruct a phantom with better visual performance and quantitative evaluation than classical FBP,MLEM and quadrate prior to MAP algorithms. The proposed algorithm can be generalized to cone-beam CT image reconstruction.
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Received: 20 March 2017
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| Fund:Grant sponsor:National Natural Science Foundation of China; grant number: 30970866; Guangzhou Municipal Science and Technology Project; grant number: llBppZLjj2120029; Guangdong Strategic Emerging Industry Core Technology Research; grant number:2011A081402003 |
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Corresponding Authors:
ZHOU Ling-hong. E-mail: smart@smu.edu.cn
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