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Motion and ΔB0 estimation in the retrospective in-vivo experiment. (a) The estimated motion parameters using 4D navigators compared with the reference estimation using high-resolution volumes. (b) Comparison of the estimated B0 changes relative to the first TR at two different head positions using the proposed navigator and reference acquisition. Based on the results, accurate estimation for both motion and ΔB0 are obtained using the 4D navigators.
