Li Xun, Li Xu, Zhu Shanan, He Bin
College of Electrical Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
Phys Med Biol. 2009 May 7;54(9):2667-82. doi: 10.1088/0031-9155/54/9/005. Epub 2009 Apr 8.
Magnetoacoustic tomography with magnetic induction (MAT-MI) is a recently proposed imaging modality to image the electrical impedance of biological tissue. It combines the good contrast of electrical impedance tomography with the high spatial resolution of sonography. In this paper, a three-dimensional MAT-MI forward problem was investigated using the finite element method (FEM). The corresponding FEM formulae describing the forward problem are introduced. In the finite element analysis, magnetic induction in an object with conductivity values close to biological tissues was first carried out. The stimulating magnetic field was simulated as that generated from a three-dimensional coil. The corresponding acoustic source and field were then simulated. Computer simulation studies were conducted using both concentric and eccentric spherical conductivity models with different geometric specifications. In addition, the grid size for finite element analysis was evaluated for the model calibration and evaluation of the corresponding acoustic field.
磁感应磁声层析成像（MAT-MI）是一种最近提出的用于对生物组织电阻抗进行成像的成像模态。它将电阻抗断层成像的良好对比度与超声成像的高空间分辨率相结合。本文采用有限元方法（FEM）研究了三维MAT-MI正向问题。介绍了描述正向问题的相应有限元公式。在有限元分析中，首先对具有接近生物组织电导率值的物体中的磁感应进行了分析。激励磁场被模拟为由三维线圈产生的磁场。然后模拟了相应的声源和声场。使用具有不同几何规格的同心和偏心球形电导率模型进行了计算机模拟研究。此外，还针对模型校准和相应声场评估对有限元分析的网格大小进行了评估。
