Lately, deep learning has been extensively investigated for accelerating dynamic magnetic resonance (MR) imaging, with encouraging progresses achieved. However, without fully sampled reference data for training, current approaches may have limited abilities in recovering fine details or structures. To address this challenge, this paper proposes a self-supervised collaborative learning framework (SelfCoLearn) for accurate dynamic MR image reconstruction from undersampled k-space data. The proposed framework is equipped with three important components, namely, dual-network collaborative learning, reunderampling data augmentation and a specially designed co-training loss. The framework is flexible to be integrated with both data-driven networks and model-based iterative un-rolled networks. Our method has been evaluated on in-vivo dataset and compared it to four state-of-the-art methods. Results show that our method possesses strong capabilities in capturing essential and inherent representations for direct reconstructions from the undersampled k-space data and thus enables high-quality and fast dynamic MR imaging.

该论文提出了一种自我监督协作学习框架（SelfCoLearn），用于从不完整的k-空间数据准确地重建动态磁共振图像，该框架包括双网络协作学习、重新采样数据增强和特殊设计的共同训练损失三个重要的组件。在体内数据集上进行评估，结果表明，该方法具有从不完整的k-空间数据中捕获必要和固有表示以实现高质量和快速动态磁共振成像的强大能力。

SelfCoLearn: 自我监督协作学习用于加速动态MR成像