Title :
Time-scale removal of "wall thump" in Doppler ultrasound signals: a simulation study
Author :
Zhang, Yu ; Cardoso, Jose C. ; Wang, Yuanyuan ; Fish, Peter J. ; Bastos, Carlos A C ; Wang, Weiqi
Author_Institution :
Dept. of Electron. Eng., Fudan Univ., Shanghai, China
Abstract :
A novel approach for blood and wall signal separation in Doppler ultrasound is proposed in the wavelet time-scale domain. The Doppler signals of different clutter-to-blood ratios from a femoral artery were simulated and used in the experiments. Compared with the conventional high-pass filtering and the signal separation in the spectrogram, the new method delivers improved performance for "wall thump" removal with minimal loss of low-flow signal.
Keywords :
Doppler effect; acoustic signal processing; biomedical ultrasonics; clutter; haemodynamics; medical signal processing; source separation; Doppler signals; Doppler ultrasound signals; blood flow signal separation; clutter-blood ratio; femoral artery; high amplitude removal; high pass filtering; human arteries wall signal separation; low flow signal loss; low frequency signals removal; signal separation; spectrogram; time scale removal; wall thump removal; wavelet time scale domain; Arteries; Blood flow; Continuous wavelet transforms; Marine animals; Source separation; Spectrogram; Time frequency analysis; Ultrasonic imaging; Wavelet analysis; Wavelet transforms; Algorithms; Artifacts; Blood Flow Velocity; Computer Simulation; Femoral Artery; Humans; Image Enhancement; Image Interpretation, Computer-Assisted; Models, Cardiovascular; Pulsatile Flow; Time Factors; Ultrasonography, Doppler;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2004.1334852
