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Abstract #0155

Spatiotemporal encoding MRI at a portable low field system without parallel imaging

Yueqi Qiu1,2, Ke Dai1,2, Sijie Zhong1,2, Hao Chen1,2, Lucio Frydman3, and Zhiyong Zhang1,2
1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China, 2National Engineering Research Center of Advanced Magnetic Resonance Technologies for Diagnosis and Therapy (NERC-AMRT), Shanghai Jiao Tong University, Shanghai, China, 3Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, Israel, Rehovot, Israel

Synopsis

Keywords: Low-Field MRI, Low-Field MRI, SPEN, Field Inhomogeneity, less distortion, low SAR

Motivation: Geometric distortions in echo-planar acquisitions pose challenges for correction in portable low-field MRI due to significant field inhomogeneities.

Goal(s): Our goal was to apply spatiotemporal encoding (SPEN) MRI at a 110 mT portable low-field system, aiming for nearly distortion-free echo-planar images.

Approach: We leveraged the low SAR in low-field MR to optimize the SPEN technique for substantial gains in sensitivity. SPEN-based 2D imaging ,3D imaging and DWI were compared with EPI-based imaging and EPI TopUp correction results.

Results: Approximately distortion-free SPEN acquisitions including robust 2D, 3D imaging and DWI demonstrated the potential clinical values of SPEN in the portable low field systems.

Impact: SPEN MRI provides a unique and robust fast echo planar acquisition approach to obtain nearly distortion-free images at low-cost portable low field systems, thereby expanding the prospects for rapid imaging, navigation, and functional imaging in portable low-field MRI.

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