Ultrasound Measurement of the Peak Blood Flow Based on a Doppler Spectrum Model
Doppler ultrasound techniques play an important role in the investigation of blood flow and, in recent decades, have become standards in cardiovascular medicine. In current clinical practice, an arterial stenosis is evaluated from the maximum blood velocity measured in an echo-Doppler investigation. Unfortunately, the blood Doppler signal produces a relative wide Doppler spectrum, and it is not trivial to detect the exact frequency that corresponds to the maximum velocity through the Doppler formula. The measurement is thus affected by high inaccuracies. In this work, a method based on a mathematical model of the Doppler spectrum is proposed to detect the frequency that corresponds to the maximum velocity. The method has been implemented in a custom electronics system and validated through experiments on a flow phantom. Experiments with flows between 100 and 300 mL/min (peak velocity range 6.6–19.9 cm/s) resulted in a bias lower t han 1% and a standard deviation 4%.
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