Title :
The enhancement of pulse-echo ultrasound signal using Adaptive filter with NLMS
Author :
Li, Dongdong ; Wang, Hui ; Deng, Juan ; Zheng, Zheng ; Bu, Zhaohui
Author_Institution :
Univ. of Shanghai for Sci. & Technol., Shanghai, China
Abstract :
The echo signal polluted by noise needs to be filtered in the ultrasound imaging system. However, the conventional fixed bandpass filter doesn´t work effectively, because the bandwidth and center frequency of the ultrasound echo signal is time-varying. The Adaptive filter with NLMS then is applied to resolve this problem. A method to evaluate its performance is also developed. Phantom experiment shows that adaptive filter with NLMS is able to enhance the SER (Signal Error Ratio) for about 8dB.
Keywords :
adaptive filters; biomedical ultrasonics; image enhancement; least squares approximations; medical image processing; phantoms; NLMS; adaptive filter; normalized least mean square method; phantom; pulse-echo ultrasound signal; signal enhancement; signal error ratio; Adaptive filters; Band pass filters; Convergence; Reflection; Scattering; Ultrasonic imaging; Wires; NLMS; SER; adaptive enhancement; time-varying;
Conference_Titel :
Biomedical Engineering and Informatics (BMEI), 2010 3rd International Conference on
Conference_Location :
Yantai
Print_ISBN :
978-1-4244-6495-1
DOI :
10.1109/BMEI.2010.5639746
