Table 3.

Number of FA clusters and their total volume with positive (“+”) and negative (“−”) correlations between FA and pulsatility index in each examined artery. Number of subjects is the same as in Table 2. Last column is volume of intersection of clusters with negative correlations and clusters in aging analysis presented in Figure 2. Clusters with positive correlations had no such overlap.

artery	+Count	−Count	+Volume (mm3)	−Volume (mm3)	−Intersection (mm3)
left VA	1	5	127	852	96
right VA	0	13	0	3031	228
BA	0	0	0	0	0
left MCA	0	12	0	3210	181
right MCA	0	3	0	421	0
left PCA	0	11	0	1994	266
right PCA	1	7	152	981	6
left ACA	2	1	248	319	3
right ACA	0	11	0	1635	193