FIGURE 5.

Top row: Correlation plots of the mean blood flow velocity (V_mean) and pulsatility index (PI) determined of all detected perforating arteries at 3 tesla (T) and of the detected perforating arteries with highest velocities at 7T MRI. The line resulting from linear regression is given by the solid line. In case of a significant correlation the equation of the regression line is given. Middle and bottom row: difference plots in absolute units (Bland Altman) and in percentage units (Pollock), respectively, for V_mean and PI. The regression line (i.e., bias) (solid line) and the limits of agreement (dotted lines) are shown. In case of a significant linear correlation, the equation of the regression line is presented. If proportional bias is absent in the Bland Altman plot, no Pollock plot is shown.