用三维重建和有限元方法对人体心脏进行力学分析

目的　建立人体心脏的三维几何模型和有限元网格模型，进行有限元仿真计算。方法　利用可视化人体心脏数据集，通过3D-DOCTOR软件和SOLIDWORKS软件重建心脏外形和内腔的三维结构数据，以STEP格式导入ABAQUS有限元软件形成网格模型。在有限元网格模型的基础上进行心脏自振频率、内腔血压等载荷情况下的力学性能分析。结果　建立了一个数字化心脏可视模型。能够反映心脏三维形状和内腔结构；得到了心脏内腔的大致容积；反映了心脏心肌不同区域的不同性质；得到了心脏3个方向的自振频率和振型，以及内腔血压下的应力分布。结论　建立了可视化三维心脏的几何和网格模型，反映了心脏的外形和内腔。利用有限元分析方法，能够为心脏的生物力学分析提供可视化的数值仿真平台。

Biomechanics Analysis on Human Heart by Establishment of three-dimension Model and Finite Element Method

Objective To establish a three-dimensional (3D) geometrical and gridding model of human heart, and carry out the finite element (FE) simulation. Method With visible data of digital human heart, a 3D structures of the heart s configurations and interior structures are constructed by software 3D-DOCTOR and SOLIDWORKS. The model has been imported into FE software ABAQUS by format STEP. The natural frequency and the stresses of the model are analyzed under the blood pressure. Result The digital model of the human heart has been developed, which could provide the 3D configurations and interior structures as well as the volume of the heart. The different mechanics behaviors in different regions within the heart has been demonstrated. The frequency and the stresses of the heart from 3 different regions have been obtained under blood pressure. Conclusions A 3D visualization geometrical and gridding model of the heart is developed by digital human data, which can show the configurations and internal structures of the heart. By using FE method, the model can be used to provide a visualization numerical simulation platform for biomechanics analysis of the heart.