Method of calculation of the blood velocity and of the dispersion of the blood velocity on the basis of the doppler signals has doors multiple

摘要

The invention relates to a method for determining the speed of the blood flow and its dispersion in using an ultrasonic doppler system. It comprises the following steps: transmitting in the sequence of the ultrasonic waves pulsed, receive a corresponding sequence of echo signals and the sample a predetermined number of delays the time after the transmission by forming a signal of the discrete time; the form of a correlation function of the signal of the discrete time and to determine the offset in time of a tip in the correlation function, to calculate the speed of the blood which is proportional to the offset in time; solve the echo signals in phase and quadrature components; determining the maximum amplitude in the correlation function of time - discreet and determine the value of the corresponding phase; to estimate the amplitude of the correlation function to each candidate possible to offset in time; and to select for the calculation of the speed of the time offsets which corresponds to the amplitude of the maximum correlation.