Shahidi A V, Savard P
Institute of Biomedical Engineering, Ecole Polytechnique, Montréal, Québec, Canada.
Med Biol Eng Comput. 1994 Jul;32(4 Suppl):S25-33. doi: 10.1007/BF02523324.
Finite element models of the human torso were constructed using anatomical data measured by serial computerised tomography scans in a subject. A first set of three models with a mesh resolution of 5517 nodes and 29810 elements included an homogeneous conductivity, lungs inhomogeneity, and heart, lungs and spinal region inhomogeneities. A second set comprised similar models with a mesh resolution of 12084 nodes and 67045 elements. A cylindrically shaped volume conductor was also constructed to evaluate the convergency and accuracy of the finite element solutions by comparison with the analytical solution. Forward simulations were performed using different excitation sites on the cardiac surface. The inclusion of conductivity inhomogeneities altered the maximum and minimum values of the body surface potentials, but did not substantially modify the pattern of the potential distributions. The greatest effect was due to the inclusion of the lungs. Increasing the mesh resolution from 5517 to 12084 nodes did not change noticeably the shape or amplitude of the simulated body surface potential maps. These models can readily be used for other bioelectromagnetic problems.
利用对一名受试者进行的系列计算机断层扫描所测量的解剖学数据构建了人体躯干的有限元模型。第一组的三个模型，其网格分辨率为5517个节点和29810个单元，包括均匀电导率、肺部不均匀性以及心脏、肺部和脊柱区域的不均匀性。第二组由类似的模型组成，其网格分辨率为12084个节点和67045个单元。还构建了一个圆柱形体积导体，通过与解析解进行比较来评估有限元解的收敛性和准确性。在心脏表面使用不同的激励点进行正向模拟。电导率不均匀性的纳入改变了体表电位的最大值和最小值，但并未显著改变电位分布模式。最大的影响归因于肺部的纳入。将网格分辨率从5517个节点增加到12084个节点，模拟的体表电位图的形状或幅度没有明显变化。这些模型可很容易地用于其他生物电磁问题。
