A dynamic programming algorithm based on the global optimization is presented to extract the maximum frequency waveform of the Doppler ultrasound blood flow signal.
提出一种基于全局优化的动态规划算法以进行超声多普勒血流信号最大频率曲线的提取。
A nonlinear filtering method based on principle component analysis (PCA) was proposed according to the statistical characteristics of the Doppler ultrasound blood flow signal and wall thump signal.
根据超声多普勒血流信号和血管壁搏动信号的统计特性，提出了一种基于主元分析的非线性滤波方法。
Color Doppler ultrasound revealed small amount of dotted blood flow signal in 55 nodes (80.9%), with no obvious blood flow signal around nodes.
彩色多普勒血流显像发现55个(80.9%)结节内少量点状血流信号，结节周边无明显血流信号。
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