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