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Fig. 2B. —63-year-old man with dizziness. Average apparent diffusion coefficient (ADC) map at same level as that seen in A displays spatial distribution of average ADC measured in three orthogonal diffusional directions. Locations of regions of interest (ROIs) in white matter (ROIs 1-4) and thalamus (ROIs 5 and 6) that were chosen for calculation of patient's mean ADC values are shown.