Flow-Guided Implicit Neural Representation for Motion-Aware Dynamic MRI Reconstruction

• URL: http://arxiv.org/abs/2511.16948v1
• Date: Fri, 21 Nov 2025 04:51:23 GMT
• Title: Flow-Guided Implicit Neural Representation for Motion-Aware Dynamic MRI Reconstruction
• Authors: Baoqing Li, Yuanyuan Liu, Congcong Liu, Qingyong Zhu, Jing Cheng, Yihang Zhou, Hao Chen, Zhuo-Xu Cui, Dong Liang,
• Abstract summary: Dynamic magnetic resonance imaging (dMRI) captures anatomy temporally-resolved but is often challenged by limited sampling and motion-induced artifacts.<n>In this work, we propose a novel implicit neural representation framework that jointly models both the dynamic image sequence and its underlying motion field.<n> Experiments on dynamic cardiac MRI datasets demonstrate that the method outperforms state-of-the-art motion-inspired and deep learning approaches.
• Score: 19.66198868468091
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Dynamic magnetic resonance imaging (dMRI) captures temporally-resolved anatomy but is often challenged by limited sampling and motion-induced artifacts. Conventional motion-compensated reconstructions typically rely on pre-estimated optical flow, which is inaccurate under undersampling and degrades reconstruction quality. In this work, we propose a novel implicit neural representation (INR) framework that jointly models both the dynamic image sequence and its underlying motion field. Specifically, one INR is employed to parameterize the spatiotemporal image content, while another INR represents the optical flow. The two are coupled via the optical flow equation, which serves as a physics-inspired regularization, in addition to a data consistency loss that enforces agreement with k-space measurements. This joint optimization enables simultaneous recovery of temporally coherent images and motion fields without requiring prior flow estimation. Experiments on dynamic cardiac MRI datasets demonstrate that the proposed method outperforms state-of-the-art motion-compensated and deep learning approaches, achieving superior reconstruction quality, accurate motion estimation, and improved temporal fidelity. These results highlight the potential of implicit joint modeling with flow-regularized constraints for advancing dMRI reconstruction.

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