Adaptive Spatial Processing for Autocorrelation-based Ultrasound Color Flow Imaging
The Doppler ultrasound technique is now commonly used in noninvasive blood flow examination.standard 1D narrowband phase-shift technique has been used to estimate the Doppler frequency shift by averaging a number of successive received echoes through the autocorrelation method.This method was regarded as an optimal algorithm in view of the estimation fidelity and its simplicity for real time implementation; however,it suffers the aliasing for velocities exceeding the Nyquist limit.To handle velocity ambiguity and offer better robustness under heavy noise conditions,we have published a spatial-temporal averaging method as a modified autocorrelation technique (MA).This method can be seen as special case of more general 2D autocorrelation methods.This paper,then,presents an adaptive spatial averaging process for the MA method so that we can enhance the velocity detectability and also maintain the high resolution of velocity differentiation.
Doppler color flow mapping aliasing autocorrelation cross-correlation spatial averaging
Qiang Wang Dong C.Liu
School of Computer Science College,Sichuan University,Chengdu,Sichuan,China
国际会议
7th Asian-Pacific Conference on Medical and Biological Engineering(第七届亚太地区生物工程学术会议)
北京
英文
2008-04-22（万方平台首次上网日期，不代表论文的发表时间）