The ability of T2*-weighted (or susceptibility-weighed) MRI to provide structural and functional information about the brain is affected by B0 field fluctuations associated with head motion, which are inadequately accounted for in current correction approaches. Here, a 3D EPI navigator was developed to measure head motion, map the associated complex B0 field changes and correct their effects in T2*-weighted GRE MRI. Adequate temporal resolution of the navigator was achieved by implementing 2D parallel imaging with controlled aliasing. A fast reconstruction strategy is proposed to retrospectively correct the motion artifacts, overcoming limitations of prospective B0 corrections inadequately dealing with the spatially complex B0 changes.
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