A model for generating Doppler ultrasound signals from pulsatile blood flow

The work presented here describes a computer model for generating Doppler ultrasound signals. The model takes into account sample volume shape and time-varying velocity field. It assumes non-turbulent blood flow parallel to the vessel walls and plane wave conditions. The simulated Doppler signal is generated by summing the contribution of all scatterers passing through the sample volume grouped into elemental volumes. Each elemental volume produces a quasi-sinusoidal signal, whose instantaneous frequency is proportional to the scatterers velocity, multiplied by a time limited window function that depends on the variation of sample volume sensitivity along the scatterers path. The model generates signals with characteristics similar to those of the Doppler signal