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An assessment on the wideband and narrowband methods for ultrasonic blood flow measurements
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作者 QI Jinyi GAO Shangkai and YANG Fusheng(Dept. of electrical engineering, Tsinghua university Beijing 100084) 《Chinese Journal of Acoustics》 1997年第1期59-70,共12页
A comparison study on the ultrasonic blood flow estimation methods is carried out in this paper. The methods are divided into two classes-narrowband and wideband techniques.The pulsed Doppler systems and the autocorre... A comparison study on the ultrasonic blood flow estimation methods is carried out in this paper. The methods are divided into two classes-narrowband and wideband techniques.The pulsed Doppler systems and the autocorrelation methods are essentially the narrowband estAnators. They give the results with low velocity resolution and probably the aliased spectrum.The wider the frequency band of the signals, the worse the results. Time domain crosscorrelation technique, wideband makimum likelihood estimation and 2D Fourier transform method are three wideband techniques. The high velocity resolution and the ability of anti-aliasing are shown by these wideband estimation strategies. 展开更多
关键词 flow An assessment on the wideband and narrowband methods for ultrasonic blood flow measurements IEEE
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