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arXiv 1901.06111cs.CV
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CRDN:基于边缘增强损失约束的动态MR级联残差稠密网络

CRDN: Cascaded Residual Dense Networks for Dynamic MR Imaging with Edge-enhanced Loss Constraint

Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences(中国科学院深圳先进技术研究院保罗·C·劳特伯生物医学成像研究中心);Nanchang University(南昌大学);University at Buffalo, The State University of New York(纽约州立大学布法罗分校)

Ziwen Ke, Shanshan Wang, Huitao Cheng, Leslie Ying, Qiegen Liu, Hairong Zheng, Dong Liang

摘要:

动态磁共振(MR)成像因其能同时提供空间和时间信息用于临床诊断而引起了广泛的研究兴趣。然而,成像速度慢或扫描时间长仍然是动态MR成像的挑战之一。现有的方法大多是在压缩感知(compressed sensing,CS)或低秩理论的指导下,从不完整的k空间数据中重建动态MR图像,迭代重建时间长。最近,深度学习在加速动态MR方面显示出巨大的潜力。我们以前的工作提出了一种动态MR成像方法,该方法通过多监督网络训练集成了k空间和空间先验知识。然而,在高加速度因子下,重建图像仍有一定程度的平滑。在这项工作中,我们提出了级联的剩余密集网络的边缘增强损失约束的动态MR成像,被称为CRDN。具体来说,级联残差密集网络充分利用了所有卷积层的分层特征,同时融合了局部和全局特征。我们进一步利用总变差(TV)损失函数,它具有边缘增强特性,用于训练网络。

英文摘要:

Dynamic magnetic resonance (MR) imaging has generated great research interest, as it can provide both spatial and temporal information for clinical diagnosis. However, slow imaging speed or long scanning time is still one of the challenges for dynamic MR imaging. Most existing methods reconstruct Dynamic MR images from incomplete k-space data under the guidance of compressed sensing (CS) or low rank theory, which suffer from long iterative reconstruction time. Recently, deep learning has shown great potential in accelerating dynamic MR. Our previous work proposed a dynamic MR imaging method with both k-space and spatial prior knowledge integrated via multi-supervised network training. Nevertheless, there was still a certain degree of smooth in the reconstructed images at high acceleration factors. In this work, we propose cascaded residual dense networks for dynamic MR imaging with edge-enhance loss constraint, dubbed as CRDN. Specifically, the cascaded residual dense networks fully exploit the hierarchical features from all the convolutional layers with both local and global feature fusion. We further utilize the total variation (TV) loss function, which has the edge enhancement properties, for training the networks.

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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