Figure 2 :18F-FDG PET images of cat frontal cortex. (a) Control group; (b) 2nd day; (c) 5th day; (d) 8th day; (e) 11th day. (Arrowheads show the 18F-FDG intensity of region of interest. Groups a and b are normal, group c reduces significantly, group D and E reduce further)