Abstract #0008

Spatiotemporal Encoding MRI in a Portable Low-Field System

Yueqi Qiu^1,2, Philip K. Lee¹, Ke Dai^1,2, Sijie Zhong^1,2, Suen Chen^1,2, Changyue Wang¹, Hao Chen^1,2, Lucio Frydman³, and Zhiyong Zhang^1,2

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

Synopsis

Keywords: YIA, Low-Field MRI, YIA, portable MRI, SPEN, Field inhomogeneity, distortion corrections, DWI

Motivation: In portable low-field MRI, echo-planar acquisitions suffer from severe distortions due to significant field inhomogeneity.

Goal(s): To apply spatiotemporal encoding (SPEN) MRI on a 110 mT portable low-field system, aiming for fast distortion-free imaging.

Approach: SPEN imaging parameters were optimized by leveraging the reduced SAR at low field strengths. SPEN-based 2D, 3D imaging, and DWI were compared with EPI on a 110 mT system. Additionally, cross-term spatiotemporal encoding (xSPEN) was implemented for in vivo and implant imaging.

Results: SPEN-based imaging demonstrated comparable image contrast and acquisition time to EPI-based methods with reduced geometric distortions.

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

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