The extent of anatomic variability must be recognized and accounted for. Normal perfusion and the acceptable limits of variability in each region must be recognized. Activity is greatest along the convexity of the frontal, temporal, parietal and occipital lobes -corresponding anatomically to cortical gray matter.
Activity is also high in the regions corresponding to the basal ganglia and thalamus.
Regions between the basal ganglia and the convexity corresponding anatomically to cortical white matter and the ventricles have less activity. Oct 13, 1995.