Fig. 5

Scatter and Bland–Altman Plots. Scatter plots (left column) of scores from R₁ parametric images (top), ePIB(20–130 s) (middle), and ePIB(1–8 min) (bottom) images (y-axis), compared to FDG (x-axis). The dashed line represents the identity. Results from the linear regression applied to the data are shown in the upper left corner of the plots and as a solid line. Bland–Altman plots (right column) show the difference between the scores provided by R₁ (top), ePIB(20–130 s) (middle), and ePIB(1–8 min) (bottom) and FDG. The solid line is at the average difference between the scores, and the dashed lines delimit the limits of agreement of the 95% interval (at mean ± 1.96 × standard deviation). Data points are coloured according to group: in red, the AD patients; in blue, the MCI+ ; in green, the MCI−; and in purple, the HC subjects