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arXiv 2011.004282020-11-01eess.IVcs.CVcs.LGeess.SP

Two-layer clustering-based sparsifying transform learning for low-dose CT reconstruction

University of Michigan - Shanghai Jiao Tong University Joint Institute, Shanghai Jiao Tong University（上海交通大学密西根学院）；Michigan State University（密歇根州立大学）

Xikai Yang, Yong Long, Saiprasad Ravishankar

备注：: 5 pages, 3 figures, submitted to ISBI2021

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Achieving high-quality reconstructions from low-dose computed tomography (LDCT) measurements is of much importance in clinical settings. Model-based image reconstruction methods have been proven to be effective in removing artifacts in LDCT. In this work, we propose an approach to learn a rich two-layer clustering-based sparsifying transform model (MCST2), where image patches and their subsequent feature maps (filter residuals) are clustered into groups with different learned sparsifying filters per group. We investigate a penalized weighted least squares (PWLS) approach for LDCT reconstruction incorporating learned MCST2 priors. Experimental results show the superior performance of the proposed PWLS-MCST2 approach compared to other related recent schemes.

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