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基于超声RF信号和TDE算法的组织振动位移估计 预览

Tissue Motion Estimation Based on Ultrasound RF Signal and TDE Algorithm
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摘要 组织的弹性系数对于组织的医学诊断有着重要的参考价值.通常,弹性系数是通过测量组织在外力 作用下的振动位移来获得,因此,组织振动位移的计算变得尤为重要.文章采用时延估计( time delay estimation, TDE)对组织振动前后的超声射频(radio frequency, R F )信号采用归一化互相关( nomialized cross COTrelation, NCC) 进行匹配分析,振动前后的参考信号和对比信号以一定的长度分解成多个窗口,组织振动使得回波信号沿时间轴 发生了移动,将对比信号的窗口以一定的搜索范围进行移动,计算出对应的归一化互相关值,获得信号之间的时延 值,从而得到组织的振动位移.实验结果显示,该方法计算出组织的振动位移值基本符合真实值,用于组织振动位 移估计是可行的. Tissue elasticity has important significance for clinic diagnosis. Generally, tissue elasticity is obtained from measuring vibration displacement of tissue which is under external force. Therefore, the measurement of tissue vibration displacement is very im-portant. In this paper, one of TDE(Time Delay Estimation) estimators, normalized cross-correlation (NCC) , was used to estimate the soft tissue time delay. Usually, signal was divided into many windows, and then NCC was adopted to calculate the matching of window between reference and delayed signal. The maximum value of the cross correlation denotes the time delay of the signals, and the tissue vibration displacement was obtained. The experimental result shows that the proposed method is feasible to estimate the tissue vibration displacement which is basically consistent with the real value.
作者 陈科 林江莉 黄冠雄 CHEN Ke1 , LIN Jiangli1, HUANG Guanxiong2(1. School o f Materials Science and Engineering, Sichuan University, Chengdu 61QQ65 China;2. UAV Industrial Technology Research Institute, Chengdu Technological University, Chengdu 61173Q China)
出处 《西华大学学报:自然科学版》 CAS 2017年第4期1-4,共4页 Journal of Xihua University:Natural Science Edition
基金 国家自然科学基金(81301286) 教育部博士点基金(20130181120001) 四川省科技支撑项目(2014GZ0005-7).
关键词 RF信号 时延估计 归-化互相关 信号插值 样条插值 超声检测 RF signal time delay estimation normalized cross correlation singnal interpolation spline interpolation ultrasonic tes-ting
作者简介 陈科(1982-),男,讲师,博士,主要研究方向为医学图像处理.E-mail:chenke@scu.edu.cn
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