The Doppler Effect is the phenomenon in which blood in veins or arteries for example are moving towards or away from the probe with different frequencies. This is mainly applied to laminar and turbulent flow within a vascular structure. When the source moves toward the listener, the perceived frequency is higher than the emitted frequency, creating a higher pitched sound. If the sound moves away from the listener, the perceived frequency is lower than the transmitted frequency, and the sound will have a lower pitch.
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