Study of Cerebral Glucose Metabolism in Healthy Volunteers Using 18 F-FDG PET: Evaluation of the Effects of Aging, Comparative Evaluation of Neurodegenerative and Psychiatric Pathologies.

The aim of the study is to obtain information on cerebral glucose metabolism measured with the 18F-FDG PET technique in normal subjects without current or previous neurological or psychiatric pathologies in order to use the data obtained for voxel-based statistical analyzes for comparison with individual subjects ( patients with disease neurological or psychiatric) which will be evaluated with the same method to improve the specificity and diagnostic sensitivity of the FDG PET exam. The objective is to obtain a functional measure of brain glucose metabolism in every normal subject because this is a functional measure of brain activity. The subjects will represent different decades of age to have a wider range of comparison with patients.