Fig. 2.

a Group average (n = 10) cross-sectional area of the MCA for 4 different delay times. Data were normalized per participant by dividing by the average MCA cross-sectional area of each individual. Note that t₂ is the delay time closest to peak diastole and t₃ the delay time closest to peak systole. There was a significant difference (* p < 0.01, paired t test) between the diastolic and systolic area. Error bars = SEM. b Increase in area from diastole (Dia) to systole (Sys) plotted against the PI for all 10 participants (no significant correlation, r² = 0.13, p = 0.35).