Non-invasive ultrasonic method for the blood flow and pressure measurements to evaluate the hemodynamic properties of the cerebro-vascular system

This paper presents a method for using ultrasonic measurements of the blood velocity and the motion of the walls of the blood vessel in simultaneous, nonin¬vasive determination of the blood pressure and blood flow rate. The measure¬ments were carried out in carotid arteries in people aged 25 to 40. On the basis of the results obtained, the vessel impedance was determined by the method of discrete Fourier transform. Analysis of the distribution of the impedance modulus and phase permitted the calculation of the parameters of the substi-tute cerebro-vascular model, such as resistance, inertia and compliance. By applying the model assumed the authors performed a computer simulation of the blood flow in the common carotid artery on the basis of the pressure determined from the movements of the walls of the artery under study. The results obtained coincide with the flows measured by the Doppler method in healthy persons.