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9-13,共5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,本文推导了声压-速度耦合方程,从而不需对边界声源进行特殊处理。针对二层同心圆盘模型,采用四种不同激励形式,分别应用有限元方法和解析解计算了声场分布,研究了不同激励对于声压波形的影响。仿真结果验证了新方法的可靠性,揭示了声源机制和声场传播特性。 Magnetoacoustic tomography with magnetic induction(MAT-MI) is a recently introduced method by integrating classic electrical impedance tomography with ultrasonic technology.In the present study,a new simulation method is proposed based on Pressure-Velocity Coupling Equation,which can avoid the singularity of the divergence of Lorentz force on the interface between two mediae.A two-layer concentric disks model was used for computer simulation studies.The distribution of sound source and the characteristics of the radiated sound fi eld were investigated in three types of stimulation.Both numerical results and analytical results confirm the validity of the proposed method.
关 键 词: 感应式磁声成像 声压 速度耦合方程 声压解析解 声源机制 声场分布
领 域: [电气工程]