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FIG 2. ROI placement. Axial FLAIR-prepped echo-planar T2-weighed images (TR/TE/TI, 10,000/91.7/2200; FOV, 40; b = 0 s/mm2) in a patient with PRES secondary to uremic encephalopathy (patient 17). Nineteen ROIs were systemically placed in 22 patients with PRES and 18 control subjects, as shown. The images were coregistered to the ADC map, on which measurements were taken. Typical ROI sizes varied with brain region, as follows: cerebellum, 400 mm2; pons, 240 mm2; lenticular nucleus, 250 mm2; corticospinal tract, 60 mm2; posterior temporal lobe, 360 mm2; caudate head, 60 mm2; thalamus, 220 mm2; occipital lobe, 360 mm2; parietal lobe, 400 mm2; frontal lobe, 500 mm2.
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