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Figure 12: The Doppler frequency shift (fd) depends on the transmitted frequency (ft) and the velocity (V) of the moving blood and the angle (θ) between the ultrasound beam and the direction of blood flow. c = speed of sound in the tissue

Figure 12: The Doppler frequency shift (fd) depends on the transmitted frequency (ft) and the velocity (V) of the moving blood and the angle (θ) between the ultrasound beam and the direction of blood flow. c = speed of sound in the tissue