Fig. 4.8 Pulsed-wave Doppler.
Pulsed-wave Doppler echocardiography allows measurement of blood flow in a specific anatomical site. The velocity of sound in soft tissue is known so the distance from the transducer can be calculated. The Doppler beam is 'range gated' by sending a short pulse of known duration and recording recorded signals a set period of time later. The transducer will begin receiving after (Ti) x 2 and stop after (T2) x 2.