论文标题

MRI重建和分析的联合频率和图像空间学习

Joint Frequency and Image Space Learning for MRI Reconstruction and Analysis

论文作者

Singh, Nalini M., Iglesias, Juan Eugenio, Adalsteinsson, Elfar, Dalca, Adrian V., Golland, Polina

论文摘要

我们提出了明确结合频率和图像特征表示的神经网络层,并表明它们可以用作频率空间数据重建的多功能构建块。我们的工作是由MRI获取引起的挑战所激发的,在MRI获取中,信号是所需图像的傅立叶变换。提出的联合学习方案既可以校正频率空间的天然伪像,又可以操纵图像空间表示,以重建网络各层的相干图像结构。这与图像重建的大多数当前深度学习方法形成鲜明对比,该方法分别处理频率和图像空间特征,并且通常在两个空间之一中仅运行。我们证明了联合卷积学习在各种任务中的优势,包括运动校正,deNOSIND,从不足采样的采集中重建,以及对模拟和现实世界多层MRI数据的结合采样和运动校正。联合模型在所有任务和数据集中都始终如一地产生高质量的输出图像。当整合到具有物理启发的数据一致性限制的最终采样重建的最先进的优化网络中时,提议的体系结构显着改善了优化景观,从而产生了减少训练时间的数量级。该结果表明,联合表示特别适合深度学习网络中的MRI信号。我们的代码和预算模型可在https://github.com/nalinimsingh/interlacer上公开获得。

We propose neural network layers that explicitly combine frequency and image feature representations and show that they can be used as a versatile building block for reconstruction from frequency space data. Our work is motivated by the challenges arising in MRI acquisition where the signal is a corrupted Fourier transform of the desired image. The proposed joint learning schemes enable both correction of artifacts native to the frequency space and manipulation of image space representations to reconstruct coherent image structures at every layer of the network. This is in contrast to most current deep learning approaches for image reconstruction that treat frequency and image space features separately and often operate exclusively in one of the two spaces. We demonstrate the advantages of joint convolutional learning for a variety of tasks, including motion correction, denoising, reconstruction from undersampled acquisitions, and combined undersampling and motion correction on simulated and real world multicoil MRI data. The joint models produce consistently high quality output images across all tasks and datasets. When integrated into a state of the art unrolled optimization network with physics-inspired data consistency constraints for undersampled reconstruction, the proposed architectures significantly improve the optimization landscape, which yields an order of magnitude reduction of training time. This result suggests that joint representations are particularly well suited for MRI signals in deep learning networks. Our code and pretrained models are publicly available at https://github.com/nalinimsingh/interlacer.

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