Keywords: Low-Field MRI, Low-Field MRI
Motivation: Low-field MRIs for point-of-care (POC) applications are emerging, especially for low- and middle-income countries and intensive care and emergency units. Diffusion-weighted imaging (DWI) is crucial for clinical practice, requiring robust DWI protocols on POC scanners.
Goal(s): Our goal was to implement a robust DWI sequence on our 46mT Halbach-based POC scanner.
Approach: Due to B0 inhomogeneities and gradient constraints, we opted for a 3D turbo-spin echo sequence with a DW spin echo pre-module. We tested the sequence using a quantitative phantom and in vivo.
Results: We obtained clean diffusion maps in phantom and in vivo, although diffusion coefficients are currently still slightly overestimated.
Impact: We implemented a DWI sequence on a 46mT MRI and acquired data in healthy brains. We evaluated the feasibility of acquiring under-sampled data to fasten acquisition and to use b-values similar to the ones used in clinical practice.
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