fig5

Figure 5. Echo-Doppler studies demonstrating the utility of employing both pulsed (A) and continuous wave (B) Doppler in resolving the issue of not capturing true velocity by pulsed Doppler. (A) The pulsed Doppler recording from the pulmonary artery did not capture the peak velocity. The highest velocity documented was only 2.71 m/s. However, a wrap-around (RA) was seen. (B) Continuous wave Doppler shows a peak velocity of 3.71 m/s. The failure of the pulsed Doppler to document the highest velocity is due to its reduced Nyquist limits and aliasing. Reproduced from Ref.^[19].