肝脏的三维可视化及切除术模拟研究

Three-Dimensional Visualization and Simulation of Liver Resection

从CT断层数据提取出肝体、动脉、静脉、门静脉和肿瘤,采用轮廓拼接技术重建出肝脏和内部管道,然后利用交互式切割工具对其进行模拟手术切割,开发出一个基于PC的肝脏可视化与模拟切割系统。系统以V isual C++为开发工具,结合可视化类库VTK,用户可通过图形界面调节不透明值并观察肝脏及其内部管道的空间结构,同时实现交互式调节切割平面以模拟肝脏肿瘤切除术。切割面的动态调节与模拟肝切除术的效果图表明针对具体病人的CT数据进行重建可以直观地展示其三维结构,通过切割的模拟有利于术前规划和选择恰当的手术方位以减少对肝实质和血管的伤害。

The contours of the liver, intra-hepatic arteries, veins, the portal vein and tumor were extracted from patient＇ s CT data, and the 3D surfaces were reconstructed by contours tiling. Then a user graphical interface was designed to simulate the surgery. A 3D visualization and virtual cutting system of liver was developed based on personal computer. The system was designed based on VTK and realized by Microsoft Visual C＋＋ 6.0. A user graphical interface was provided to observe the spatial relationship among the tumor and blood vessels by adjusting the transparency of the object. By interactively modifying the cutting plane, the process of performing an operation for the tumor was simulated. Simulation of the cutplane adjusted and liver resection show that the system could present with vivid profile of the liver and internal vessels in full views based on the patient CT data, and the simulation of surgery cutting is useful for preoperative planning, which could reduce the damage to the liver and vessels by appropriate planning.