Continuous-wave Doppler ultrasound
Continuous-wave Doppler utilizes continuous transmission and reception of ultrasound waves. This is accomplished by two dedicated transducer elements: one that solely sends a signal and another that only receives. As no pulses are emitted, CW Doppler does not permit us to determine where the wave is reflected. It is not site specific. We only know that the depicted velocity curve stems from a reflector somewhere along the path of the ultrasound beam, which is known as the CW Doppler line. The advantage of CW Doppler is its ability to measure high velocities, which are frequently observed in pathologies of the heart (e.g. aortic stenosis).
