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arXiv 2407.03034eess.IVcs.AI
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用于在MR图像重建中共享低秩、图像和k空间信息的注意力融合网络以实现单次屏气心脏电影成像

Attention Incorporated Network for Sharing Low-rank, Image and K-space Information during MR Image Reconstruction to Achieve Single Breath-hold Cardiac Cine Imaging

University of Tuebingen(蒂宾根大学);Technical University of Munich(慕尼黑工业大学);Imperial College London(伦敦帝国学院);Stanford University(斯坦福大学);Klinikum Rechts der Isar, Technical University of Munich(慕尼黑工业大学右岸医院)

Siying Xu, Kerstin Hammernik, Andreas Lingg, Jens Kuebler, Patrick Krumm, Daniel Rueckert, Sergios Gatidis, Thomas Kuestner

AI总结:

本文提出A-LIKNet,通过并行分支共享低秩、图像和k空间多域信息并引入注意力机制,实现高达24倍加速的高质量心脏电影MRI重建,为单次屏气成像提供可能。

摘要:

心脏电影磁共振成像(MRI)在临床实践中可对心脏形态和功能进行准确评估。然而,MRI需要较长的采集时间,近期基于深度学习的方法在加速成像和提升重建质量方面展现出巨大潜力。现有网络存在一些共同局限,制约了进一步加速的可能性,包括单域学习、依赖单一正则化项以及特征贡献均等。为解决这些局限,我们提出将来自多个域的信息(包括低秩、图像和k空间)嵌入一种新型深度学习网络用于MRI重建,并将其命名为A-LIKNet。A-LIKNet采用并行分支结构,能够在k空间和图像域中独立学习。耦合信息共享层实现域间信息交换。此外,我们在网络中引入注意力机制,为更关键的线圈或重要时间帧分配更大权重。训练和测试在一个内部数据集上进行,该数据集包括91名心血管患者和38名健康受试者,使用回顾性欠采样进行2D心脏电影扫描。此外,我们还在来自OCMR数据集的实时8倍前瞻性欠采样数据上评估了A-LIKNet。结果表明,我们提出的A-LIKNet优于现有方法,并提供高质量重建。该网络能够有效重建高达24倍加速的高度回顾性欠采样动态MR图像,表明其具有单次屏气成像的潜力。

英文摘要:

Cardiac Cine Magnetic Resonance Imaging (MRI) provides an accurate assessment of heart morphology and function in clinical practice. However, MRI requires long acquisition times, with recent deep learning-based methods showing great promise to accelerate imaging and enhance reconstruction quality. Existing networks exhibit some common limitations that constrain further acceleration possibilities, including single-domain learning, reliance on a single regularization term, and equal feature contribution. To address these limitations, we propose to embed information from multiple domains, including low-rank, image, and k-space, in a novel deep learning network for MRI reconstruction, which we denote as A-LIKNet. A-LIKNet adopts a parallel-branch structure, enabling independent learning in the k-space and image domain. Coupled information sharing layers realize the information exchange between domains. Furthermore, we introduce attention mechanisms into the network to assign greater weights to more critical coils or important temporal frames. Training and testing were conducted on an in-house dataset, including 91 cardiovascular patients and 38 healthy subjects scanned with 2D cardiac Cine using retrospective undersampling. Additionally, we evaluated A-LIKNet on the real-time 8x prospectively undersampled data from the OCMR dataset. The results demonstrate that our proposed A-LIKNet outperforms existing methods and provides high-quality reconstructions. The network can effectively reconstruct highly retrospectively undersampled dynamic MR images up to 24x accelerations, indicating its potential for single breath-hold imaging.

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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