Abstract #3773
Physiological artifact suppression in multi-shot data using covariance-map-enhanced navigator correction
Jacco A de Zwart 1 , Peter van Gelderen 1 , and Jeff H Duyn 1
1
Advanced MRI, LFMI, NINDS, National
Institutes of Health, Bethesda, MD, United States
MR signal stability in brain, and thus image quality, is
significantly affected by physiological noise,
predominantly from the respiratory cycle. Navigator
echoes or real-time shimming (dynamic updating of shims
and center frequency) can be used to compensate or
correct for this but have practical limitations. We
propose the incorporation of a covariance map of
temporal signal fluctuations, acquired separately, in a
navigator-based correction strategy. This covariance map
describes the spatial distribution of the temporal field
changes that are derived from navigator phase evolution
during the multi-shot experiment.
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