Learned Alternating Minimization Algorithm for Dual-domain Sparse-View CT Reconstruction

• URL: http://arxiv.org/abs/2306.02644v2
• Date: Tue, 6 Jun 2023 01:52:18 GMT
• Title: Learned Alternating Minimization Algorithm for Dual-domain Sparse-View CT Reconstruction
• Authors: Chi Ding, Qingchao Zhang, Ge Wang, Xiaojing Ye and Yunmei Chen
• Abstract summary: We propose a novel Learned Minimization Algorithm (LAMA) for dual-domain-view CT image reconstruction. LAMA is provably convergent for reliable reconstructions.
• Score: 6.353014736326698
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We propose a novel Learned Alternating Minimization Algorithm (LAMA) for dual-domain sparse-view CT image reconstruction. LAMA is naturally induced by a variational model for CT reconstruction with learnable nonsmooth nonconvex regularizers, which are parameterized as composite functions of deep networks in both image and sinogram domains. To minimize the objective of the model, we incorporate the smoothing technique and residual learning architecture into the design of LAMA. We show that LAMA substantially reduces network complexity, improves memory efficiency and reconstruction accuracy, and is provably convergent for reliable reconstructions. Extensive numerical experiments demonstrate that LAMA outperforms existing methods by a wide margin on multiple benchmark CT datasets.

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