Time-delay estimation in ultrasound echo signals using individual sample tracking.
The performance of many signal-processing applications in ultrasound medical imaging, including elastography, blood flow imaging, tissue velocity imaging, and acoustic radiation force impulse imaging, depends on the performance of their time-delay estimators. In this paper, we present a new time-delay estimator based on the tracking of individual samples using a continuous representation of the echo signal. We also present the use of the same interpolation approach to improve the performance of the zero-crossing tracking delay estimator. Simulation results show that sample tracking algorithms significantly outperform commonly used window-based algorithms in terms of bias and standard deviation. Sample tracking algorithms also have higher sensitivity and resolution compared with traditional delay estimators, including recently introduced spline-based continuous time-delay estimators, because they provide the displacement of individual samples. Experimental results demonstrating the viability of sample tracking delay estimation are also presented.
Zahiri-Azar
Reza
R
Department of Electrical and Computer Engineering, University of British Columbia, BC, Canada. zahiri@ece.ubc.ca
Salcudean
Septimiu E
SE
D000465:Algorithms; D003198:Computer Simulation; D008954:Models, Biological; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014463:Ultrasonography / Q000379:methods*