Real-time simulation of first porta treatment based on position based dynamic

The first porta is an important anatomical structure located on the diaphragmatic side of the liver and consists of various types of vessels and connective tissue which encases the vessels. Treatment of the porta is an important step in hepatic trauma surgery and requires extensive surgical experience. Virtual reality technology provides a good platform for training and teaching hepatobiliary surgery. Due to the complexity and specificity of the hepatoportal anatomy, there is a lack of relevant research in the field of medical virtual reality. In this paper, we propose a real-time simulation method for porta processing based on the position-based dynamic method to address the above problem. we built the visual simulation model of connective tissue and vessel. Then, we constructed a hybrid physical model during tetrahedral filling of the connective tissue surface model, in which the coarse tetrahedral mesh is responsible for shape matching algorithm-based deformation simulation and interacts with the visual simulation model; the fine tetrahedral mesh is responsible for the cutting simulation via the matching tetrahedral method. The final simulation operation of the porta treatment procedure was completed on a graphic workstation. The deformation and cutting processes of the model cause little delay, and the simulation process is smooth (> 30 Hz). Therefore, the modeling method proposed in this paper presents a solution to the problem of modeling medical virtual reality containing vascular organs.