In color flow imaging, the scatterer velocity is estimated by exploiting the change in the RF or baseband signal due to scatterer movement over several pulse emissions. Different approaches exist to accomplish this. The estimation of the Doppler spectrum as in PW-Doppler is not a practical solution. Few temporal samples are available and would lead to poor spectrum estimates, and the sheer amount of information would in any case be difficult to visualize properly. Instead, parameters reflecting properties.