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One of the WMH ROIs identified by the FLAIR image (A). Co-registering the FLAIR and PWI scans (B) ensured correct ROI placement in the PWI maps (C; example for CBF). WMH = White matter hyperintensity, ROI = region of interest, FLAIR = fluid-attenuated inversion recovery, PWI = perfusion weighted imaging, CBF = cerebral blood flow.
