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arXiv 1907.01262eess.IVcs.CVcs.LG
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用于少视图CT的双网络架构--在ImageNet数据上训练并传输用于医学成像

Dual Network Architecture for Few-view CT -- Trained on ImageNet Data and Transferred for Medical Imaging

Rensselaer Polytechnic Institute(伦斯勒理工学院);Koning Corporation(Koning公司)

Huidong Xie, Hongming Shan, Wenxiang Cong, Xiaohua Zhang, Shaohua Liu, Ruola Ning, Ge Wang

摘要:

X射线计算机断层摄影(CT)从投影数据重建横截面图像。然而,与CT扫描相关的电离X射线辐射可能诱发癌症和遗传损伤。因此,减少辐射剂量已引起极大关注。少视图CT图像重建是降低辐射剂量的重要课题。近年来,数据驱动算法在解决少视角CT问题上显示出巨大的潜力。在本文中,我们开发了一个双网络架构(DNA)重建图像直接从正弦图。在所提出的DNA方法中,基于点的全连接层学习反向投影过程,所需的内存比现有技术少得多。该方法使用O(C*N*N_c)参数,其中N和N_c分别表示重建图像的维数和投影数。C是一个可调参数,可以设置为低至1。我们的实验结果表明,DNA产生了竞争力的表现超过其他国家的最先进的方法。有趣的是,当真实患者图像数量有限时,自然图像可以用于预训练DNA以避免过拟合。

英文摘要:

X-ray computed tomography (CT) reconstructs cross-sectional images from projection data. However, ionizing X-ray radiation associated with CT scanning might induce cancer and genetic damage. Therefore, the reduction of radiation dose has attracted major attention. Few-view CT image reconstruction is an important topic to reduce the radiation dose. Recently, data-driven algorithms have shown great potential to solve the few-view CT problem. In this paper, we develop a dual network architecture (DNA) for reconstructing images directly from sinograms. In the proposed DNA method, a point-based fully-connected layer learns the backprojection process requesting significantly less memory than the prior arts do. Proposed method uses O(C*N*N_c) parameters where N and N_c denote the dimension of reconstructed images and number of projections respectively. C is an adjustable parameter that can be set as low as 1. Our experimental results demonstrate that DNA produces a competitive performance over the other state-of-the-art methods. Interestingly, natural images can be used to pre-train DNA to avoid overfitting when the amount of real patient images is limited.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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