论文标题
从计算机2层析成像数据中开发有限元的基于有限元的触觉互动手术模拟
Development of a finite element based haptic interactive surgery simulation from Computer 2 Tomography data
论文作者
论文摘要
虚拟模型对于医学成像研究中使用的培训和教学工具很重要。我们引入了一个工作流程，该工作流程可用于将体积医学成像数据（由计算机断层扫描（CT）生成）转换为基于计算机的模型，在该模型中，我们可以在其中进行工具与组织的相互作用。此过程分为两个步骤：图像分割和工具组织交互。我们通过创建肝脏模型来证明这种流线型工作流的实用性。已经使用粘性元素开发了用于探针插入的Fe模型，以模拟组织破裂现象。进行基于FE的模拟，并将结果与各种发表论文的模拟进行比较。还开发了控制针头上反应力的分析模型。在对称尖端针和斜角尖端上作用于轴向和横向的反作用力表达式。这些模型考虑了由于将针包含在组织中而导致的针和摩擦力所产生的局部组织变形，但不考虑组织破裂韧性参数GC的作用，因此在基于FE的模拟中可见一些差异以及这些分析结果。
Virtual models are important for training and teaching tools used in medical imaging research. We introduce a workflow that can be used to convert volumetric medical imaging data (as generated by Computer Tomography (CT)) to computer-based models where we can perform interaction of tool with the tissue. This process is broken up into two steps: image segmentation and tool-tissue interaction. We demonstrate the utility of this streamlined workflow by creating models of a liver. A FE model for probe insertion has been developed using cohesive elements to simulate the tissue rupture phenomena. FE based simulations are performed and the results are compared with that of various published papers. An analytical model that governs the reaction forces on the needle tip has also been developed. Expressions for reaction forces acting in both axial and transverse directions on a symmetric tip needle and a bevel tip needle are developed. These models consider local tissue deformation by the needle and the frictional forces generated due to the inclusion of the needle in the tissue, but do not consider the role of tissue rupture toughness parameter Gc due to which some differences are visible in FE based simulations and these analytical results.
