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Sinogram restoration for low-dose X-ray computed tomography using regularized Perona–Malik equation with intuitionistic fuzzy entropy

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Abstract

Edges and flat areas in the sinogram of low-dose X-ray computed tomography are difficult to distinguish. This lack of distinction leads to excessive smoothing in the sinogram restoration. To address this problem, we propose a sinogram restoration algorithm using the regularized Perona–Malik (P–M) equation with intuitionistic fuzzy entropy. Firstly, considering the sinogram fuzziness, a novel edge indicator function is constructed using both the gradient magnitude and intuitionistic fuzzy entropy. Secondly, using the constructed edge indicator function as the diffusion coefficient, a novel regularized P–M equation smoothing model is presented. The proposed model overcomes the shortage of traditional P–M equations, which are ill-conditioned. Moreover, it performs diffusion with different directions and intensities in different regions of the sinogram. The optimal solution of the proposed algorithm is obtained by using the additional operator splitting method. Finally, the reconstructed image is achieved by filtered back projection from the smoothed sinogram. Experimental results show that the presented method can retain important edges while smoothing noise and perform better than others.

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Acknowledgements

The work reported here was supported by the National Key Scientific Instrument and Equipment Development Project (2014YQ24044508); the National Key Research and Development Program of China (2016YFC0101602); the Natural Science Foundation of Shanxi Province (2015011046); the Shanxi Province Science Foundation for Youths (201601D021080, 201701D221106); and the Taiyuan University of Science and Technology doctoral promoter (20162044, 20152020). The authors thank the anonymous reviewers for their valuable comments and suggestions to improve the quality of this paper.

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Correspondence to Zhiguo Gui.

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Shangguan, H., Zhang, X., Cui, X. et al. Sinogram restoration for low-dose X-ray computed tomography using regularized Perona–Malik equation with intuitionistic fuzzy entropy. SIViP 13, 1511–1519 (2019). https://doi.org/10.1007/s11760-019-01496-3

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