Research On 3D Geometric Finite Elements Modeling Of Human Facial Soft Tissue

3D geometric finite elements modeling of human facial soft tissue is a very important step of craniofacial surgery simulation. As an interdiscipline research topic, surgery simulation incorporates the researcher about Computer Science, Image Processing, Computer Graphics, Modern Medicine, Scientific Computing Visualization, etc. The object of surgery simulation research is to provide a reusable environment for surgery training and planning, and ease the propagation of new surgery methods.This article studies 3D geometric finite elements modeling of human facial soft tissue. Regarding the facial soft tissue deformation problem in simulation of plastic surgery, this paper propose a simplified method of human facial modeling using geometric finite elements which is based on cylinder projection. First, we apply regional growing algorithm to separate the hob from CT data and Marching Cubes algorithm to get the original skin data and skull data, then we use cylinder projection and the filter to get the skin and skull data which are one-to-one correspondence, take pentahedron as finite element, so the regular geometric model is formed.This article focuses on several major research:(1) In the 3D medical image reconstruction process, improved Marching Cubes algorithm has been applied to get the 3D data of the head, resolve the uncertainty of the ambiguity surface, ensure that the isosurface has topological consistency.(2) In the process of medical image modeling, we apply cylinder projection algorithm which is used to produce cylindrical panoramic images, get very good results. The points of 3D epidermis data and 3D skull data are one-to-one correspondence, and the regular finite element index is formed.(3) We adopt pentahedron as finite element, so the triangles of 3D epidermis data and 3D skull data are one-to-one correspondence, and it is beneficial for the followed-up deformation work.The experimental results show that this method applies geometric model to simulate the facial tissue, sets up the regular finite elements in the premise of visual effects and precision, improves the real time application and practicability of the model.