The Doppler Principle and the Study of Cardiac Flows

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The Doppler Principle and the Study of Cardiac Flows
The Doppler Equation

Fig.1.6

This Doppler effect in tissues maybe expressed as an equation as shown in Figure 1.6. Simply stated, the Doppler shift (Fd) of ultrasound will depend on both the transmitted frequency (fo) and the velocity (V) of the moving blood. This returned frequency is also called the "frequency shift" or "Doppler shift" and is highly dependent upon the angle (?) between the beam of ultrasound transmitted from the transducer and the moving red blood cells. The velocity of sound in blood is constant (c) and is an important part of the Doppler equation.

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