ContextMRI: Enhancing Compressed Sensing MRI through Metadata Conditioning

TL;DR

ContextMRI introduces a metadata-conditioned diffusion model for MRI reconstruction, leveraging clinical metadata to significantly improve image quality and reconstruction accuracy in compressed sensing MRI.

Contribution

This work presents the first diffusion model-based MRI reconstruction method that incorporates clinical metadata via text conditioning, enhancing reconstruction fidelity.

Findings

Metadata conditioning improves reconstruction quality across datasets.

Increasing metadata detail boosts performance.

The method outperforms traditional approaches in various scenarios.

Abstract

Compressed sensing MRI seeks to accelerate MRI acquisition processes by sampling fewer k-space measurements and then reconstructing the missing data algorithmically. The success of these approaches often relies on strong priors or learned statistical models. While recent diffusion model-based priors have shown great potential, previous methods typically ignore clinically available metadata (e.g. patient demographics, imaging parameters, slice-specific information). In practice, metadata contains meaningful cues about the anatomy and acquisition protocol, suggesting it could further constrain the reconstruction problem. In this work, we propose ContextMRI, a text-conditioned diffusion model for MRI that integrates granular metadata into the reconstruction process. We train a pixel-space diffusion model directly on minimally processed, complex-valued MRI images. During inference, metadata is converted into a structured text prompt and fed to the model via CLIP text embeddings. By conditioning the prior on metadata, we unlock more accurate reconstructions and show consistent gains across multiple datasets, acceleration factors, and undersampling patterns. Our experiments demonstrate that increasing the fidelity of metadata, ranging from slice location and contrast to patient age, sex, and pathology, systematically boosts reconstruction performance. This work highlights the untapped potential of leveraging clinical context for inverse problems and opens a new direction for metadata-driven MRI reconstruction.