What Is Nyquist Limit Echo

The Nyquist limit represents the maximum Doppler shift frequency that can be correctly measured without resulting in aliasing in color or pulsed wave ultrasound.

What is the importance of the Nyquist limit?

This theorem states that the highest frequency which can be represented accurately is one half of the sampling rate. The Nyquist rate specifies the minimum sampling rate that fully describes a given signal; in other words a sampling rate that enables the signal’s accurate reconstruction from the samples.

What is aliasing velocity in Echo?

Aliasing is an imaging error when information of velocity of the blood flow is higher than the Nyquist velocity. The Nyquist velocity may set on color Doppler echocardiography tools. The blood flows velocity displays as scale and direction in the range of Nyquist velocity.