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This is a Experimental Study study.

September 17, 2025

3D-EPI SWI at 0.5T

Key Points

3D-EPI at 0.5T showed good sensitivity to susceptibility differences in brain tissue, improving diagnostic capabilities.
The optimized sequence achieved reasonable resolution and good signal-to-noise ratio while removing Nyquist ghost artifacts.
Multi-shot 3D-EPI techniques were employed, using linear phase correction and dual-polarity GRAPPA for effective imaging.
Lower field strength MRI may expand access for clinical diagnosis of conditions like cerebral microbleeds.

Abstract

Motivation: 3D-EPI has shown great potential for susceptibility weighted imaging (SWI) on high field MRI due to its high sampling efficiency. It may be feasible to achieve fast and superior quality for SWI at low-field strength. Goal(s): To optimize a 3D-EPI SWI sequence at 0.5T for reasonable resolution and good SNR, as well as suppression of Nyquist ghost. Approach: A multi-shot 3D-EPI sequence was used to acquire SWI data, with acquisition parameters tuned based on literature. Linear phase correction and dual-polarity GRAPPA were used to remove Nyquist ghost. Results: 3D-EPI demonstrated good sensitivity to susceptibility difference in brain tissue on 0.5T. Impact: 0.5T with 3D-EP-SWI offers greater access than higher field strength MRI, and may meet clinical needs for diagnosis of cerebral diseases like cerebral microbleeds.

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3D-EPI SWI at 0.5T

Key Points

Abstract

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