The Doppler blood flow signal is inherently a nonstationary Gaussian random process whose time-frequency representation associates with the time-varying velocity of blood flow and its variations.
多普勒超声血流信号是一个非平稳的高斯随机过程，其时频分布与血流的速度及其变化有密切的关系。
Doppler signal reflects blood flow velocity, and the number of the catastrophe chop points can be used to predict coronary heart diseases and route status of blood vessel.
多普勒信号反映了血流速度，多普勒信号突变点的数量，一定程度上可以对冠心病预报，并反映心肌血管路径状况。
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