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Abstract #1621

High-accuracy off-resonance estimation from EPI, with application to volumetric navigators (vNavs) enabling real-time motion and frequency correction

M. Dylan Tisdall 1,2 and Andr J. W. van der Kouwe 1,2

1 A. A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts, United States, 2 Radiology, Harvard Medical School, Boston, Massachusetts, United States

The phase-correction navigators of EPI sequences have previously be shown to enable real-time estimation and prospective correction of resonance frequency drift. In the present work we describe a novel algorithm that provides more accurate estimates than previous methods. We also demonstrate how a small modification to our EPI-based volumetric navigator (vNavs), allows us to use it not just for prospective motion correction, but also prospective frequency correction. Results from a vNav-enabled MPRAGE sequence are shown.

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