Physics-Driven Zero-Shot MRI Reconstruction with Non-local Image Priors

Lingtong Zhang; Wenlei Li; Mu He; Li Xiao; Yang Ji

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arXiv · 2606.15110

Physics-Driven Zero-Shot MRI Reconstruction with Non-local Image Priors

Lingtong Zhang·Wenlei Li·Mu He·Li Xiao·Yang Ji

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Abstract

Zero-Shot Self-Supervised Learning (ZS-SSL) has emerged as a promising paradigm for accelerated Magnetic Resonance Imaging (MRI) reconstruction, eliminating the reliance on fully-sampled external datasets. However, learning solely from a single under-sampled scan suffers from supervision scarcity and optimization instability, often leading to overfitting or artifacts. To address these challenges, we propose a robust physics-driven ZS-SSL framework that synergizes physical consistency with image-domain non-local priors. Our method introduces three core innovations: (1) a Coil Sensitivity Map (CSM)-Guided Dynamic Repository, which stabilizes the training trajectory by filtering physically inconsistent artifacts based on coil sensitivity constraints; (2) a SPIRiT-based regularization, which enforces k-space self-consistency via a learned correlation kernel and stochastic masking; (3) a Non-Local Self-Similarity (NSS) Pixel Bank, which leverages the high-fidelity reference established by the former modules to explicitly mine non-local anatomical similarities, thereby augmenting supervision in the image domain. Extensive experiments on the FastMRI dataset demonstrate that our approach achieves state-of-the-art performance, particularly under high acceleration factors, effectively bridging the gap between zero-shot learning and supervised methods. The code is available at https://github.com/Zolento/NS-SSL.

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BibTeX RIS

Lingtong Zhang, Wenlei Li, Mu He, Li Xiao, Yang Ji. 2026-06-13. Physics-Driven Zero-Shot MRI Reconstruction with Non-local Image Priors. https://arxiv.org/abs/2606.15110

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