METHOD FOR CALCULATING BLOOD SPEED AND BLOOD SPEED DISPERSION FROM MULTI-DOOR DOPPLER SIGNALS

摘要

P The invention relates to a method for determining the speed of blood flow and its dispersion using a Doppler ultrasonic system. It includes the following steps: transmitting pulsed ultrasonic waves in sequence, receiving a corresponding sequence of echo signals and sampling them a predetermined number of time delays after transmission by forming a discrete time signal; forming a correlation function of said discrete time signal and determining the time offset of a peak in said correlation function; calculating the blood speed proportional to said time offset; resolving said phase and quadrature component echo signals; determining the maximum amplitude in the time-discrete correlation function and determining the corresponding phase value; estimate the amplitude of the correlation function for each possible candidate for time offset; and select to continue calculating the speed, the time offset that corresponds to the maximum correlation amplitude. /P