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双工超声系统与血管扫描器连用可测量人体股动脉的血流量。双工超声系统内的一个晶体发射超声脉冲(频率为5 MHz),根据取样体积的位置,分段控制和确定接收回波,把多普勒频移信号馈给已编程的血管扫描器,得到8个心动周期平均频移,用专门编写的计算机程序,可联机计算出血流量.对这种技术的准确度,用流量设备作了证实.临床研究表照:未患外周脉管疾病的大量受试者中,股动脉的平均静息流量率为350±141mlsmin。每个受试者的重复测量有很大变化,这在很大程度上是由生理波动引起的(总的变化趋势为75%).充血反应期间,血流量的暂时变化,具有某种依赖
Duplex ultrasound system with vascular scanner can be used to measure the human femoral artery blood flow. A crystal in the duplex ultrasound system emits an ultrasonic pulse (at a frequency of 5 MHz) feeding the Doppler shifted signal to a programmed blood vessel scanner based on the position of the sampled volume, the segmented control and the determination of the received echo, resulting in 8 cardiac cycles average frequency shift, with specially prepared computer program, online calculation of blood flow on the accuracy of this technology, with the flow of equipment to make a confirmed clinical study table: not suffering from a large number of peripheral vascular disease In the trial, the mean resting flow rate of the femoral artery was 350 ± 141 mls min. Repeated measurements vary significantly for each subject, which is largely due to physiological fluctuations (overall change trend of 75%) .There is a temporary dependence of blood flow during the hyperemic reaction with some dependence