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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