Spatiotemporal Encoding MRI in a Portable Low-Field System

作者：Yueqi Qiu, Philip R. Lee, Ke Dai, Sijie Zhong, Suen Chen, Changyue Wang, Hao Chen, Lucio Frydman, Zhiyong Zhang · 发表于：Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition · 年份：2025 · DOI：10.58530/2025/0008 · 研究领域：Advanced MRI Techniques and Applications、Atomic and Subatomic Physics Research、Photoacoustic and Ultrasonic Imaging

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.