A prior-based metal artifact reduction algorithm for x-ray CT

	A prior-based metal artifact reduction algorithm for x-ray CT
	Li, M.; J. Zheng; T. Zhang; Y. H. Guan; P. Xu and M. S. Sun
	2015
发表期刊	Journal of X-Ray Science and Technology
卷号	23 期号:2 页码:229-241
摘要	In computed tomography (CT), metal objects in the scanning filed are accompanied by physical phenomenon that causes projections to be inconsistent. These inconsistencies produce bright and dark shadows or streaks in analytically reconstructed images. Interpolation-based metal artifact reduction (MAR) algorithms usually replace the inconsistent projection data by estimating surrogate data based on the surrounding uncorrupted projections. In such cases, secondary artifacts will be generated when the data estimates are inaccurate. Therefore, better projection estimation is critical. This paper proposes an image post-processing strategy to create an intermediate image, named the prior image and better estimates of the surrogate data by forward projecting this prior image. The proposed method consists of three steps based on the forward projection MAR framework. First, metallic implants in the uncorrected images are segmented using a Markov random field model (MRF). Then a prior image is generated via an edge-preserving filter and a recovery procedure of the adjacent anatomical structures. Finally, the projection is completed via forward projecting this prior image and the corrected image is reconstructed by the filtered back-projection (FBP) method. Studies on both phantom and clinical data are carried out to verify the performance of the proposed method. The comparisons with other previous MAR algorithms demonstrate that the proposed MAR method performs better in metal artifact suppression and anatomical structure preservation.
收录类别	SCI ; EI
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/55302
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Li, M.,J. Zheng,T. Zhang,et al. A prior-based metal artifact reduction algorithm for x-ray CT[J]. Journal of X-Ray Science and Technology,2015,23(2):229-241.
APA	Li, M.,J. Zheng,T. Zhang,Y. H. Guan,&P. Xu and M. S. Sun.(2015).A prior-based metal artifact reduction algorithm for x-ray CT.Journal of X-Ray Science and Technology,23(2),229-241.
MLA	Li, M.,et al."A prior-based metal artifact reduction algorithm for x-ray CT".Journal of X-Ray Science and Technology 23.2(2015):229-241.

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