Design And Implementation Of Virtual Simulation System For Abdominal Surgery

Although virtual surgery has attracted extensive attention of researchers due to its excellent clinical practicability,in the process of actual research and development,there are still many problems,such as high cost of research and development,great difficulty of development,wide technical span and so on.Not only that,there are some difficulties in visual and tactile fusion of virtual surgery system,which leads to some tactile differences between most surgical simulation and real surgery.In this context,this paper,adhering to the principle of practicality and ease of use,taking the common abdominal surgery as the research object to design and implement a virtual abdominal surgery system.First of all,a three-dimensional model of abdominal organ tissue was constructed.In order to find a universal and high-precision segmentation scheme,this paper proposes an organ segmentation algorithm based on subjective threshold and three-dimensional labeling technology.While ensuring the efficiency of the algorithm,manual correction is introduced to improve the applicability and segmentation accuracy.The extracted organs are reconstructed by 3DDoctor software,the edge folding algorithm based on the quadratic error metric and the Meshlab mesh optimizer were used to simplify the model.Real-time performance of the system is ensured by reducing the computational burden.Secondly,the interactive function of virtual surgery system is realized.Collision detection is the basis of all interactive functions.According to the idea of hierarchical bounding box collision detection algorithm,a grid based collision bounding box is introduced,which shows a strong advantage in tightness.With regard to the cutting problem of the mesh model,this paper proposes a vertex splicing method based on the minimum distance partition,which deals with the cutting points on the cutting road in turn,and divides the mesh according to the minimum distance between the cutting points and the nearest vertices,ensure the efficiency while minimizing the impact on model quality.In terms of tactile interaction,according to the properties of spring-mass model,a feedback force calculation method based on thin plate spline interpolation is studied to solve the problem that the feedback force can not reflect the soft hardness of organs.Finally,with the help of HTC Vive headset virtual reality equipment and Phantom Premium 1.5 force feedback device,this paper integrates the abdominal virtual surgery system in Unity3 D,the performance and clinical practical value of the system are tested and verified through experiments,and researchers in related fields are invited to score subjectively.The results show that the system can simulation the related operation of abdominal operation,the reliability and operational fluency have been affirmed,and it is easy to realize,which has positive significance for clinical treatment and operation training.