The obtained gradient-echo sequence images were stored in the Sun graphics workstation and were corrected using FuncTool software (GE Healthcare, Chicago, IL, USA). Two experienced radiologists who were unaware of the clinical data reviewed the regions of interest (ROIs) in the corrected phase images. Five ROIs were identified: the bilateral precentral gyrus (15–25 pixels), frontal cortex (15–25 pixels), caudate nucleus (25–35 pixels), globus pallidus, and putamen. To measure the phase-shift value in the precentral gyrus, the three slices with the largest amount of phase shift were selected. To measure phase-shift values in the frontal cortex, caudate nucleus, globus pallidus, and putamen, the slice with the highest phase-shift value among three measurements was selected.

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