论文标题

限量角度计算机断层扫描的模型引导的深网

A model-guided deep network for limited-angle computed tomography

论文作者

Wang, Wei, Xia, Xiang-Gen, He, Chuanjiang, Ren, Zemin, Lu, Jian, Wang, Tianfu, Lei, Baiying

论文摘要

In this paper, we first propose a variational model for the limited-angle computed tomography (CT) image reconstruction and then convert the model into an end-to-end deep network.We use the penalty method to solve the model and divide it into three iterative subproblems, where the first subproblem completes the sinograms by utilizing the prior information of sinograms in the frequency domain and the second refines the CT images by using the prior information of CT空间域中的图像,最后一个将前两个子问题的输出合并。在每次迭代中,我们使用卷积神经网络(CNN)近似前两个子问题的解决方案,因此获得了有限角度CT图像重建的端到端深网。我们的网络既可以处理正式图和CT图像,又可以同时抑制由数据不完整的数据引起的伪影并在CT图像中恢复精细的结构信息。实验结果表明,我们的方法优于有限角度CT图像重建的现有算法。

In this paper, we first propose a variational model for the limited-angle computed tomography (CT) image reconstruction and then convert the model into an end-to-end deep network.We use the penalty method to solve the model and divide it into three iterative subproblems, where the first subproblem completes the sinograms by utilizing the prior information of sinograms in the frequency domain and the second refines the CT images by using the prior information of CT images in the spatial domain, and the last merges the outputs of the first two subproblems. In each iteration, we use the convolutional neural networks (CNNs) to approxiamte the solutions of the first two subproblems and, thus, obtain an end-to-end deep network for the limited-angle CT image reconstruction. Our network tackles both the sinograms and the CT images, and can simultaneously suppress the artifacts caused by the incomplete data and recover fine structural information in the CT images. Experimental results show that our method outperforms the existing algorithms for the limited-angle CT image reconstruction.

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