ANALYSIS OF THE DOPPLER ULTRASOUND SIGNAL BY WAVELET PACKET TRANSFORM
ANALYSIS OF THE DOPPLER ULTRASOUND SIGNAL BY WAVELET PACKET TRANSFORM
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DOI：
10.1142/s021951940400103x
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发表时间：
2004-09
影响因子：
0.8
通讯作者：
F. Meghnefi;F. B. Reguig;M. Brahami
中科院分区：
文献类型：
--
作者：
F. Meghnefi;F. B. Reguig;M. Brahami
本文研究了利用小波包变换在频谱-时间域分析动脉的超声多普勒信号。频谱-时间表示是通过在频率子带上对多普勒信号进行分解来获得的，使用与选择良好的小波相关联的滤波器组。结果表明，分解的程度取决于多普勒信号的平稳性，选择合适的小波类型可以得到动脉血流速度的最佳剖面。三种类型的小波已经在先前从颈动脉和股动脉记录的两个多普勒信号上进行了测试。当与所选小波相关联的滤波器组的频带在频域中规则分布，且分解层数为7时，可获得最佳表示。
The study presented in this paper is concerned with the analysis of the ultrasound Doppler signal of the arteries in the spectro-temporal domain using the wavelet packet transform. The spectro-temporal representation is obtained by the decomposition of the Doppler signal in frequency sub-band, using filter banks associated with a well chosen wavelet. It is shown that the decomposition level depends on the stationarity of the Doppler signal, and the best profile of blood flow velocity in arteries is obtained according to an appropriate choice of wavelet type. Three types of wavelets have been tested on two Doppler signals previously recorded from the carotid and femoral arteries. The best representation is obtained when the frequency sub-bands of the filter bank associated with chosen wavelet are regularly distributed in the frequency domain and the level of decomposition is 7.