Simulation Of Cardiovascular Stent Interventional Surgery Based On Virtual Reality Technology

As the level of material increases,people’s ways of thinking begin to change.More and more people are focusing on human health.Cardiovascular disease is one of the diseases that pose a huge threat to human health.According to the National Center for Cardiovascular Diseases,cardiovascular deaths in 2017 continued to account for the leading cause of death among urban and rural residents,and the number of cardiovascular patients will continue to increase in the next 10 years.The consequent need for surgeons to cure cardiovascular disease has also become an important factor in mitigating this threat.However,the training of cardiovascular disease surgeons requires a lot of time and resources for training.As a new research field,the virtual surgery system can effectively shorten the appointment period of cardiovascular intervention surgeons,provide a new learning method for medical students,and provide a platform for cardiovascular surgeons to carry out effective surgical planning and simulation.Therefore,the study of cardiovascular interventional stent surgery is of great significance for the treatment of cardiovascular diseases.In this paper,the following work is carried out on the three-dimensional modeling of the cardiovascular and stent of the cardiovascular stent interventional training system,the interactive display technology of the heart organ tracking of the head posture,and the force feedback three modules:Firstly,the 2D CT image of the real patient is used as the data source.The VTK visualization software package is used to reconstruct the 3D model of the cardiac vascular surface including the isosurface data and the 3D volume rendering of the cardiac vascular including the soft tissue data and anatomy of the surgical organ.The model realizes the three-dimensional visualization of the two-dimensional medical image slice,and provides the surgeon with three-dimensional surgical object.Then,the three-dimensional cardiac vascular model based on the face-painting reconstruction is used to construct the bounding box model to segment the internal blood vessel surface data.A surface model of an arterial surgical vessel that is extracted to obtain a cardiac stent intervention;a three-dimensional organ model of cardiac stent intervention with a more realistic angiographic simulation effect is produced by combining surface rendering with volume rendering;Visual development tool VTK’s 3D geometric modeling of surgical stents.Secondly,this thesis aims at the construction and management of virtual surgical operation object space.Through the homogeneous coordinate system transformation of VTK world space coordinate system,VTK view space coordinate system and PATRIOT^TM head pose tracking device space coordinate system,VTK visual development is realized.The synchronization of the reconstructed three-dimensional surgical organ object coordinate system and the spatial mapping of the head pose tracking device and the coordinate system of the surgical organ object in the virtual scene.It realizes the display technology of virtual surgery heart organ tracking real-time changes with the virtual surgeon’s head posture.Finally,based on the law of conservation of mass and hemodynamics,the model of the blood flow of the stent and coronary blood vessels is established.The hemodynamic model we created and the PHANTOM Desktop device are used to realize the intravascular push of the surgical stent.The force feedback calculation completed the force feedback in the virtual surgical system of cardiovascular stent intervention,and realized the force feedback of the surgical stent and blood flow viscous resistance during the process of pushing the surgical stent in the cardiovascular stent interventional system,as well as the surgical stent and blood vessel.Wall collision detection research.The experimental results show that this paper improves the authenticity of the virtual surgical training environment of cardiovascular stenting by combini-ng the algorithm research of cardiovascular stenting training system with PATRIOT^TM head posture tracking device and PHANTOM Desktop force feedback device.