What is the Nyquist limit formula used to calculate?

The Nyquist limit formula is a fundamental concept in ultrasound physics, specifically related to Doppler imaging. It is used to calculate the maximum frequency detectable in ultrasound. The Nyquist limit is defined as half of the pulse repetition frequency (PRF). In Doppler ultrasound, if the Doppler shift frequency from blood flow exceeds the Nyquist limit, it can lead to aliasing, where high velocities appear misrepresented as lower velocities.

By understanding this limit, sonographers can ensure that they are operating within a suitable frequency range to provide accurate measurements of blood flow velocities. Therefore, knowing how to calculate the Nyquist limit is essential for preventing misinterpretations of physiological data in cardiac assessments.