检测散射元间距的多分辨率分析方法  

Estimation of Scatterrer Spacing in Biological Tissue with Multiresolution Analysis

作　　者：刘忠国[1,2] 王明时[1,2] 关红彦 吕扬生[1,2] 

机构地区：[1]天津大学精仪学院生物医学工程与科学仪器系,天津300072 [2]山东大学控制科学与工程学院生物医学工程系,济南250061

出　　处：《信号处理》2004年第2期138-142,共5页Journal of Signal Processing

摘　　要：本文研究了从生物组织的背向散射信号中提取散射元间距信息的多分辨率分析方法。从文中构造一维生物组织超声散射模型可以看到,散射元间距信息隐含在背向散射信号的低频包络中。本文采用绝对值检波方法作多分辨率分析的预处理,并采用能量最大准则确定检测的敏感尺度。仿真试验结果表明,这种方法可以有效地提取出背向散射信号中低频包络信息,准确地检测出散射元的位置;具有较强的抗噪性。Multiresolution analysis is used to estimate the scatterer spacing in biological tissue from the back-scattering signal. Seeing from the modeling of ultrasonic scattering in biological tissue in one-dimension, the information of the scatterer spacing is included in the envelope of the back-scattering signal. In order to demodulate the low-frequency envelope from the signal, absolute value of the signal is calculated. The scale with the maximal energy is used as the sense scale of detecting scatterer spacing. The simulation result shows that this method is efficient to demodulate the low-frequency envelope from the signal, and it is precise to estimate the scatterer spacing , and the antinoise characteristic is good.

关 键 词：多分辨率分析 生物组织 散射元间距 超声背向散射 

分 类 号：TN911.6[电子电信—通信与信息系统]