PMC

(A) Normal subject with region map overlaid. Green, frontal; orange, parietal; red, central gyrus; blue, occipital; dark red, thalamus. (B) Normal subject (80-year-old woman). (C) Subject with Alzheimer disease (AD) (84-year-old woman). (D) Poststroke no dementia subject (80-year-old woman). (E) Poststroke dementia (PSD) subject (81-year-old woman). Note parietal hypoperfusion in the subject with AD and asymmetric perfusion in PSD due to a large infarct.