Fig. 1. Image segmentation of MRI slices: (a) Heart; (b) torsoMRI切片的图像分割　(a) 心脏; (b) 躯干

Fig. 2. Personalized three-dimensional heart-torso model.个性化心脏-躯干三维几何模型

Fig. 3. The second-order tetrahedral element with 10 nodes.二阶10节点四面体单元

Fig. 4. Discretized three-dimensional heart-torso model: (a) 3D cardiac model; (b) heart-torso model.离散的心脏-躯干三维模型　(a) 心脏三维模型; (b) 心脏-躯干模型组合

Fig. 5. Evolution of excitation potential u at t = 20, 40, 60. Solid line: numerical solution of FHN equation. Dotted line: analytical solution of FHN equation. t = 20, 40, 60时, 激发电位u的变化　实线: FHN方程数值解; 虚线: FHN方程行波解

Fig. 6. TMP distribution of a cardiac cycle: (a), (b), (c) Depolarization process (t = 30, 60, 90); (d), (e), (f) repolarization process (t = 120, 150, 180). 一个心动周期的TMP分布图　(a), (b), (c) 为去极化过程 (t = 30, 60, 90); (d), (e), (f)为复极化过程(t = 120, 150, 180)

Fig. 7. TMP time evolution curve, solid line: right ventricular TMP; dashed line: left ventricular TMP.TMP随时间变化曲线　实线: 右心室TMP变化; 虚线: 左心室TMP变化

Fig. 8. (a) Straight wire model; (b) distribution of magnetic field on the axial plane. Solid line: analytical solution; dotted line: numerical solution.(a) 直导线模型; (b)中轴面磁感应强度的分布, 实线: 解析解; 虚线: 数值解

Fig. 9. Relative error distribution of magnetic field.磁场的相对误差分布

Fig. 10. Extracorporeal magnetic field distribution: (a)−(h) Simulated cardiac magnetic distribution (t = 40, 60, 80, 100, 120, 140, 160, 180); (i) measured human MCG in the literature. 体表外磁感应强度 分布　(a)−(h) 模拟的心磁分布图(t = 40, 60, 80, 100, 120, 140, 160, 180)；(i) 文献中的实测心磁图分布图^[26]