一种基于改进顶点拆分的软组织切割仿真算法

A Soft Tissue Cutting Simulation Algorithm Based on Improved Vertex Split

软组织切割作为虚拟手术系统中的重要部分,其逼真度在很大程度上影响虚拟手术的真实感。本文针对顶点拆分法的缺点,提出基于圆弧拟合的改进顶点拆分算法。该算法通过切口深度来计算切口大小,使用2条圆弧对切口形状进行模拟,根据离散的步长计算离散点数目,最终融合入原来的组织网格。仿真实验结果表明,改进后的顶点拆分法相比原算法在切割操作的仿真中,在保证实时性的情况下,具有更好的真实性。

As an important part of virtual surgery system, the soft tissue cutting can largely affect the authenticity of virtual sur- gery. Aiming at the disadvantage of vertex split algorithm, this paper presents an improved vertex split algorithm based on arc fit- ting. Firstly, we calculate the size of the incision according to the depth of the incision. Secondly, the shape of the incision is simulated using two arcs. Then, we get the number of discrete points according to the discrete steps. Finally, new grid is blended into the original grid. The simulation results show that the improved vertex split algorithm can produce more authentic effect than original algorithms under the circumstances of real-time simulation.