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    • 14. 发明授权
    • Doppler blood flow system and method using low frequency noise signal
processing
    • 多普勒血流系统及方法采用低频噪声信号处理
    • US4993418A
    • 1991-02-19
    • US302406
    • 1989-01-26
    • Billy L. WeaverDirk R. Smith
    • Billy L. WeaverDirk R. Smith
    • A61B8/06G01F1/66G01P5/24G01S15/52G01S15/58
    • A61B8/06A61B8/12G01F1/663G01P5/242G01S15/52G01S15/582
    • A Doppler blood flow system and method in which an ultrasonic wave is reflected off of red blood cells in blood flowing in tubing. The reflected ultrasonic wave is digitally processed in the frequency domain. The flow rate of the blood is directly related to the average frequency of the Doppler signal. The typical Doppler signal is not a single frequency representing a single flow rate but is really an entire range of frequencies in which certain frequencies predominate which are indicated by increased amplitude of the signal when plotted in the frequency domain. The typical Doppler signal may actually have two "humps", one at a higher frequency which represents the actual information bearing content of the signal related to flow rate and one at a lower frequency which is caused by vibrations in the blood tubing system itself and could be caused by motor noise from the blood pump. Since the flow rate is related to average frequency of the information bearing portion of the typical Doppler signal, the low frequency "hump" must be taken out of the Doppler signal in order to obtain an accurate flow rate.
    • 一种多普勒血流系统和方法,其中超声波从管道中流动的血液中的红细胞反射出来。 反射超声波在频域进行数字处理。 血液的流速与多普勒信号的平均频率直接相关。 典型的多普勒信号不是表示单个流量的单一频率,而是实际上是在频率范围内绘制时信号幅度增加表示某些频率占优势的整个频率范围。 典型的多普勒信号可能实际上具有两个“隆起”,一个在较高的频率处,一个表示与流量有关的信号的实际信息承载内容,一个在较低频率下由血管系统本身的振动引起, 由血泵的电机噪音引起。 由于流量与典型多普勒信号的信息承载部分的平均频率有关,所以必须从多普勒信号中取出低频“驼峰”,以获得准确的流量。