Time-scale analysis of quadrature Doppler ultrasound signals

被引：9
|
作者：
Aydin, N [1 ]
Markus, HS [1 ]
机构：
[1] Univ London St Georges Hosp, Sch Med, Div Clin Neurosci, London SW17 0RE, England
来源：
IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY | 2001年 / 148卷 / 01期
关键词：
D O I：
10.1049/ip-smt:20010106
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Most Doppler ultrasound systems employ quadrature demodulation techniques at the detection stage. The information concerning flow direction, encoded in the phase relationship between in-phase and quadrature-phase channels, is not obvious at this stage. The complex fast Fourier transform can be used to obtain directional information in the frequency domain, as well as time-frequency analysis of Doppler signals. However, it has an inherent time-frequency resolution limitation. The wavelet transform allows the time-frequency resolution compromise to be optimised. Mapping directional information in the scale domain is also desirable. A method is described, based on the utilisation of complex wavelets and negative scales. It eliminates the intermediate processing stages for obtaining directional Doppler signals for time-scale analysis.
引用
收藏
页码：15 / 22
页数：8
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