Power doppler ultrasound

Patent Pending Sonography can be enhanced with Doppler measurements, which employ the Doppler effect to assess whether structures (usually blood)[10] are moving towards or away from the probe, and its relative velocity. By calculating the frequency shift of a particular sample volume, for example flow in an artery or a jet of blood flow over a heart valve, its speed and direction can be determined and visualised. This is particularly useful in cardiovascular studies (sonography of the vascular system and heart) and essential in many areas such as determining reverse blood flow in the liver vasculature in portal hypertension.