Figure 4.

Density scatter plots and Pearson correlations between TDI after SIFT and ${\text{AFD}}_{\text{total}}^{\text{ms}}$ (a), ${\text{AFD}}_{\text{total}}^{\text{ms}}$ and V_in (b), ${\mathrm{AFD}}_{\text{total}}^{\text{ss}}$ and V_in (c) using all the white matter voxels of the same subject shown in Figure 2. Red denotes higher density of points, and blue denotes lower density. The solid line indicates the result of linear least squares fitting.