基于全聚焦算法的骨折超声成像研究  

Study on ultrasonic fracture detection based on total focusing method

作　　者：宋小军 张璠[1] 黄琼 曾俊冬 SONG Xiaojun;ZHANG Fan;HUANG Qiong;ZENG Jundong(College of Electronics and Information Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Department of Electronic Engineering,Fudan University,Shanghai 200433,China;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海电力大学电子与信息工程学院,上海200090 [2]复旦大学电子工程系,上海200433 [3]上海大学机电工程与自动化学院,上海200444

出　　处：《声学技术》2021年第4期475-481,共7页Technical Acoustics

基　　金：中国博士后科学基金面上项目(2019M661334)。

摘　　要：为研究便捷、安全、无电离辐射的骨折检测方法,提出了超声双层折射修正全聚焦算法。首先从信号处理入手,通过回波信号与标准发射信号进行互相关计算,得出噪声含量极低的回波信号。继而利用Filed-Ⅱ裂纹仿真实验验证全聚焦成像对均匀介质检测的可行性,仿真结果显示裂纹宽度平均相对误差为5.60%;最后对离体牛胫骨进行全矩阵数据采集,并分别使用传统全聚焦算法和双层折射修正全聚焦算法对贯通骨折裂纹成像,前者的裂纹平均相对误差为8.33%,但不能显示骨板厚度,而后者不仅可以清晰地显示出裂纹的宽度(相对误差为6.98%),并且可以准确地显示出骨板下底面的位置,从而可以对骨板厚度进行准确评估(骨板厚度相对误差为5.75%)。因此,基于全聚焦成像的超声检测方法在骨折检测上具有较好的发展潜力。To study a convenient,safe and non-ionizing method for fracture detection,a total focusing method for ultrasonic double-layer refraction correction is proposed.Starting from the signal processing and imaging algorithm,the cross-correlation calculation between echo signal and standard emission signal is performed to obtain echo signal with very low noise.Then,the feasibility of total focusing method in homogeneous medium is verified by using the Field II crack simulation experiment,and the simulation result shows that the average relative error of crack width is 5.60%.Finally,the full matrix data collection is carried out for the in-vitro bovine tibial plate,and the traditional total focusing method and the double-layer refraction modified total focusing method are used to image the bone fracture.The former method is able to image the fracture with the average relative error 8.33%,however,fails to image the bottom surface of the bone.The latter method not only shows the fracture(relative error is 6.98%)clearly,but also shows the bottom surface of the bone,by which the thickness of the bone is accurately measured(relative error is 5.75%).Therefore,the ultrasonic total focusing method has application potential in the detection of bone fracture.

关 键 词：骨折 超声检测 双层介质 全聚焦成像 

分 类 号：TB559[理学—物理]