Self-Navigated Multi-Shot and Multiband SPEN DWI for Portable Low-Field MRI
Digital Poster (2026 ISMRM Meeting)
Date:
Synopsis
Keywords: Portable MRI, Diffusion-weighted imaging, SPEN
Motivation: EPI-based diffusion at low-field portable scanners suffers from severe field inhomogeneity-induced distortions, limited phase correction in multi-shot acquisitions due to few receive coils, and low SNR efficiency, which further constrains diffusion performance.
Goal(s): To develop self-navigated multi-shot and RF-encoded multiband SPEN DWI methods that provide phase-corrected diffusion imaging with reduced distortion and enhanced SNR efficiency.
Approach: Multi-shot and multiband SPEN DWI sequences were implemented on a 110 mT portable MRI system, using SPEN’s intrinsic self-navigation to correct motion-induced phase inconsistencies across shots and multiband dimensions.
Results: The proposed approach achieved phase-corrected, low-distortion DWI with improved SNR efficiency, without relying on multi-coil parallel imaging.
Impact: Self-navigated multi-shot SPEN DWI enables inter-shot phase correction with reduced distortion, while multiband SPEN DWI increases SNR efficiency. Together, these methods demonstrate phase-corrected, low-distortion diffusion imaging on portable low-field MRI without parallel imaging.
Link: https://echo.ismrm.org/abstracts/view/a9ec32d2-a90f-44de-9abd-79c64e7ef732