基于信号统计特性的超声成像方法

介绍合成孔径聚焦超声成像的基本原理。为进一步提高成像分辨率和信噪比,研究超声回波信号的相关性,根据缺陷信号和噪声信号的不同统计特性,提出一种基于信号相关性分析的非线性合成孔径算法。实验结果表明:与传统的延时叠加合成孔径算法相比,新方法提高了图像的横向分辨率和信噪比。

Ultrasonic Imaging Technology Based on Statistic Characters of the Signal

This paper introduces the principle of ultrasonic imaging system based on Synthetic Aperture Focusing Techno-logy,At the same time,to improve the resolution and signal to noise ratio,the statistics characters of ultrasonic signal and a non-linear SAFT algorithm based on correlation coefficient are studied.Results of the test indicate:comparing with the time-delay SAFT principles,the axial resolution and S/N obviously through the new SAFT principle are improved.