Fig. 7.

Variability of velocity and wall shear stress (WSS) waveforms measured in vivo in five New Zealand White rabbits, averaged over the image region and three cardiac cycles. Each column corresponds to a single animal. In the first and third rows are velocity and WSS waveforms acquired with contrast-enhanced ultrasound image velocimetry (CEUIV) or contrast-free UIV (CFUIV). In the second and fourth rows are corresponding Bland–Altman plots for velocity and WSS. Dashed lines mark ±1.96 standard deviation, indicating the level of agreement between CEUIV and CFUIV.