FIGURE 5.  Graph showing positive linear correlation between decline in ¹⁸F-FDG uptake in caudate (A; r² = 0.34, P = 0.003) or putamen (B; r² = 0.44, P = 0.0001) and estimated number of years until HD onset in presymptomatic gene-positive subjects. Positive linear correlation was found between decreased striatal ¹⁸F-FDG uptake and expected years until onset.