作　　者： ; ; ; ; ; ; ; ; ;

机构地区： 中国科学院电工研究所

出　　处： 《现代科学仪器》 2010年第1期14-16,23,共4页

摘　　要： 感应式磁声成像是一种融合了传统电阻抗成像和超声成像的新的电阻抗成像技术。为了解决洛伦兹力在边界上的不连续性造成其散度存在奇异性的问题,本文针对导出的声压-速度耦合方程,通过消去声压变量,得到了声源为洛伦兹力的位移方程,从而不需对边界声源进行特殊处理。针对单层圆盘,分别应用位移方程和声压-速度耦合方程计算了声场波形,验证了新方法的可靠性。仿真结果表明,新方法较声压-速度耦合法计算效率高。分别采用两种不同激励源形式,利用位移法计算了声场分布,研究了不同激励对于声压波形的影响。本文的研究工作可以为实验平台的搭建和设计提供理论参考。 Magnetoacoustic tomography with magnetic induction（MAT-MI） is a recently introduced method by integrating classic electrical impedance tomography and ultrasonic technology.In the present study,a new simulation method is proposed based on Displacement equation to avoid the singularity of the divergence of Lorentz force on the interface between two mediae.A Mono-layer disk model was used for computer simulation studies.The new method was confi rmed by the simulations based on displacement equation,compared with that of Pressure-Velocity Coupling Equation,the simulation results also show that the former method has higher computational efficiency than the latter one.The characteristics of sound field distribution,sound pressure and wave form under two types of stimulation were investigated by the new method based on displacement equation.This research work can offer theoretical references for the design and construction of experimental facilities.

关 键 词： 感应式磁声成像 正问题 位移方程 声场分布

领　　域： [电气工程]