On the Aliasing Problem in Pulsed Doppler Cardiac Studies

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Abstract
In pulsed Doppler echocardiography the maximum measurable velocity is limited due to the aliasing phenomenon. Particularly in cardiac echo studies in adults, aliasing may occur frequently. The principle of and the parameters that influence aliasing will be explained. The importance of aliasing is demonstrated in examples of tricuspid, mitral, and aortic Doppler echocardiographic studies in adults. Ways to reduce or avoid aliasing are presented. Indexing Words: Doppler echocardiography Aliasing · Zero shift · Extended range · Secondary sample volumes.