Wei-qi W, Lin-xin Y
Ultrasound Med Biol. 1982;8(4):421-5. doi: 10.1016/s0301-5629(82)80010-0.
A method for measuring the absolute blood flow velocity waveform is reported. Two independent beams of ultrasound illuminate a vessel simultaneously, producing complementary Doppler signals. The two Doppler frequency shift signals are processed by subtraction and addition at the receiver. The optimum probe position where blood flow velocity is detected can be found as the position where the subtractor output reaches zero. At this position the blood flow velocity is the output from the adder. By this means the influence of the angle between the probe and blood flow is eliminated so that a quantitative measurement is obtained. Both in vitro and clinical results are reported.
本文报道了一种测量绝对血流速度波形的方法。两束独立的超声束同时照射血管，产生互补的多普勒信号。这两个多普勒频移信号在接收器处通过减法和加法进行处理。血流速度检测的最佳探头位置可通过减法器输出为零的位置来确定。在此位置，血流速度即为加法器的输出。通过这种方式，消除了探头与血流之间角度的影响，从而实现了定量测量。文中报道了体外和临床结果。
