大张角共焦换能器对振动声成像的影响  

Influence of the confocal transducer with a wide aperture angle on vibro-acoustography

作　　者：戚萌 刘晓宙[1] 刘杰惠[1] 毛一葳[1] QI Meng;LIU Xiaozhou;LIU Jiehui;MAO Yiwei(Key Laboratory of Modern Acoustics,MOE,and Institute of Acoustics,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京大学声学研究所,近代声学教育部重点实验室,南京210093

出　　处：《应用声学》2018年第5期751-757,共7页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(11774167),声场声信息国家重点实验室开放课题研究基金项目(SKLA201809)

摘　　要：振动声成像是超声成像的一种重要形式,它可以得到包含共焦区组织的弹性信息和声衰减信息的信号,将接收到的信号用于成像即可获得反映组织特性的图像。该文对大张角共焦换能器作用下振动声成像中声辐射力和切变位移进行了理论计算和数值模拟,并通过改变张角变化及频率大小研究其对声辐射力和切变位移的影响。这项工作为大张角共焦换能器在振动声成像中的应用提供了理论支持。Vibro-acoustography is an important form of ultrasonic imaging.It can obtain the signal that contains the elastic information and the acoustic attenuation information of the tissue in confocal area,the received signal can be used for imaging that reflects the characteristics of the tissue.In this paper,under the action of confocal transducer with a wide aperture angle,the theoretical calculation and numerical simulation of acoustic radiation force and shear wave displacement in vibro-acoustography are carried out.The influences of the aperture angle and frequency on acoustic radiation force and shear wave displacement are studied separately.This work provides theoretical support for the application of the confocal transducer with a wide aperture angle used in vibro-acoustography.

关 键 词：振动声成像 声辐射力 剪切波位移 

分 类 号：O424[理学—声学]