Fig. 5

Process of obtaining the manual flow curves. Delineated magnitude VE scan (a). Velocity VE scan with the manual contours (b). Velocity-Time curve computed using the contours and the velocity VE scan, transit time computed using the foot-to-foot method(c) using the half-max method (d) and the cross-correlation method (e). For the time velocity curves, x-axis is the trigger delay in ms and y-axis is the velocity in cm/s. Red curve is the velocity-time curve for the ascending aorta (ROI1), the green curve is the velocity-time curve for the descending aorta (ROI2), ta stands for arrival time, delta stands for transit time, Dist is the length of the aortic arch and PWV is the pulse wave velocity