Physiological artifact suppression in multi-shot data using covariance-map-enhanced navigator correction

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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