Doppler ultrasonography
ultrasonography in which the shifts in frequency between emitted ultrasonic waves and their echoes are used to measure the velocities of moving objects, based on the principle of the Doppler effect. The waves may be continuous or pulsed; the technique is frequently used to examine cardiovascular blood flow (Doppler echocardiography). See also color flow Doppler imaging, under imaging, pulsed wave Doppler u., and continuous wave Doppler u.
Medical dictionary.
2011.