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Regions of interest (ROIs) used to reconstruct the corticospinal tract (CST) on diffusion tensor imaging. The stippled lines indicate the ROIs. The solid lines indicate the seed ROI for the corticospinal tract. (A) Coronal color FA map; (B) Sagittal color FA map; (C) The seed ROI of CST at the pontomedullary junction; (D) The seed ROI of CST at the mid-pons.
