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Abstract #0898

Multi-Shot Multi-Echo xSPEN technique for permanent gradient portable low-field MRI systems

Yueqi Qiu1, Philip Kenneth Lee1, Suen Chen1, Ke Dai1, Changyue Wang1, and Zhiyong Zhang1
1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China

Synopsis

Keywords: Low-Field MRI, Acquisition Methods

Motivation: In single-sided/built-in gradient portable low-field MRI systems, imaging suffers from severe distortions due to significant field inhomogeneity and gradient nonlinearity.

Goal(s): Develop a multi-shot multi-echo cross-term Spatiotemporal Encoding (MSME xSPEN) sequence in a constant gradient low-field environment.

Approach: The MSME xSPEN technique, by designing a image-domain multi-shot technique, achieves multiple contrasts and higher acquisition efficiency. It was evaluated against traditional xSPEN using a 110mT portable MRI system that emulates a constant gradient low-field environment.

Results: MSME xSPEN exhibited in-plane resilience to field inhomogeneities and demonstrated higher SNRs with multiple contrasts compared with traditional xSPEN.

Impact: MSME xSPEN provides a novel image-domain distortionless acquisition approach for highly inhomogeneous low-field MRI systems. This technique will improve image quality and inspire new acquistion strategies in portable single-sided or built-in gradient systems.

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