Figure 8.

An ultrasonic flow meter waveform was used to test the theoretical prediction for the %-error of a volume flow estimate as given in eqn (9). (A) A sample of the carotid waveform in the canine for data in Fig. 7, with an average flow of approximately 200 mL min⁻¹ and a standard deviation of 137.8 mL min⁻¹. (B) The estimated relative error was computed as waveform standard deviation over waveform mean. A fit of the estimated percent error yields $\%-\text{error}=68.9∕\sqrt{N}$ with r² = 0.998.