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Abstract #0496

Accelerated B0 Mapping and Distortion Correction in Ultra-Low Field MRI Using Locally Low-Rank Reconstruction

Yiming Dong1, Tom O’Reilly1, Chloé Najac1, Andrew Webb1, and Beatrice Lena1
1C.J. Gorter MRI Center, Department of Radiology, LUMC, Leiden, Netherlands

Synopsis

Keywords: Low-Field MRI, Low-Field MRI

Motivation: Low-field MRI systems are promising tools for accessible medical imaging but are highly sensitive to B0 inhomogeneities, especially in portable environments where external disturbances may affect magnetic fields.

Goal(s): This study aimed to develop a method for accelerated B0 mapping and distortion correction in ultra-low field MRI, maintaining image quality while reducing scan time.

Approach: We used a locally low-rank (LLR) reconstruction approach on two undersampled (R=2) datasets with shifted and unshifted TEs for B0 mapping and distortion correction.

Results: LLR reconstruction provided high-quality distortion-corrected images comparable to fully-sampled (R=1) acquisitions, even under extreme inhomogeneity from simulated external magnetic disturbances.

Impact: This approach enables faster, distortion-corrected imaging for low-field MRI in varied settings, expanding its potential for accessible, portable medical imaging in remote and resource-limited environments.

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Keywords