[Measurement of blood flow velocity, blood volume flow and arterial cross section using the integral Doppler ultrasonic method--comparison and synthesis of two solutions].

Starting with a short comparison of the space resolving, pulsed Doppler method with the integral Doppler techniques for blood flow measurement, the formula is derived, after which the profile independent cross-sectional mean velocity v is to be measured using the integral method. When evaluating the Doppler signal power, moreover, volume flow Q can be measured. Two versions of the integral method for volume flow Q, one with (WAVUD) and the other without (WUVUD), and the need for a separate determination of the angle of incidence are explained and compared. Combination of the two results in a new method for measuring the mean velocity v and cross-sectional area F of blood flow from one single sound direction, without the need for determining the angle of sound incidence into the artery. The main problems of the integral method are addressed and in vitro test results are reported, showing that 20% measurement accuracy should be practical in vivo.