Effect of Nyquist limit and color gain on color Doppler signals
by Nanda Navin C

Comprehensive Textbook of Echocardiography

by Navin C Nanda
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In this video clip, the color gain has been gradually lowered till the stationary artifactual echoes outside the RV cavity have just disappeared. Thus, both the Nyquist limit and the color gain have been standardized and the jet area (arrowhead) now can be inspected for accurate assessment of TR severity. The regurgitant jet area occupies >35% of the right atrium indicating the presence of severe TR.

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