抄録
Fractal dimension images were generated by a pixel-by-pixel method. The fractal dimension at the target pixel was estimated as Hausdorff dimension (D) which is defined as n (r)=D (1/r) using the surrounding NxN unit cell, where r varies 1 to N-1 and n (r) is the number of unit voxel r covering the three dimensional surface of the unit cell N.We apply this method for the glucose metabolic rate and the oxygen metabolic images of the brain in 5 patients with Alzheimer disease and in 2 normal cases. Mean fractal dimension of the cerebral functional images increased and the fitting error decreased as N increased. In a patient with typical Alzheimer disease, low glucose metabolic rate regions with higher or lower fractal dimension were observed.
