管道骨骼线三维重建在肝脏可视化的应用

目的 研究三维重建数字化虚拟肝脏的方法.方法 将肝脏管道灌注后的肝脏标本进行螺旋CT扫描,获取CT扫描连续图像数据集.然后使用面绘制移动立方体(MC)算法重建肝脏及其内部管道结构表面模型,并对模型进行平滑和简化.确定出管道树上的关键节点,并使用改进的种子生长法生成管道树.将生成管道的表面模型和管道树相结合实现交互式分析.结果 肝脏管道灌注和铸型良好,螺旋CT扫描获取连续肝脏断面图像数据集242张.基于骨骼线提取的肝脏管道结构三维重建肝脏模型形态逼真,交互性强,通过设定各结构的透明度和颜色能单独或组合显示肝脏、肝静脉和下腔静脉、门静脉、胆囊,并可通过旋转、放大、缩小模型观察各结构.结论 基于肝脏管道骨骼线的方法进行肝脏及其管道系统三维重建可视化肝脏,生成肝脏和内部管道系统,立体空间感强,交互性好.

Application research of three-dimensional reconstruction in the digitalized virtual liver based on hepatic vessel skelecton line

Objective To study the methodology of three-dimensional reconstruction of the digitalized virtual liver.Methods The liver was perfused with filling materials in different colors through hepatic ducts and scanned by hispeed CT to obtain the image dataset.CT images were preprocessed in binary way.The Marching Cube(MC)algorithm,a kind of surface rendering,were employed to reconstruct 3D surface models of liver and intrahepatic ducts,and then these 3D surface models were smoothed and simplified.The abstract vessel trees were constructed,after the skeleton line of the vessel system were extracted from the hepatic CT dataset.The extracted vessel tree was combined with the vessel surface model for analyzing the vessel structure interactively.Results In the reconstituted liver model,the images of liver parenchyma,hepatic veins and portal veins were vividly displayed respectively or in combination.This visible system of liver provided a graphics user interface to rotate and scale the 3D liver to observe 3D morphological features of the liver and intrahepatie duct by setting the pellucidit value and colors.Conclusion 3D liver model with intrahepatic vessel.which was 3-dimensionally reconstructed in the method of skeleton line using CT scanning images,has good interaction,powerful immersion and great imagination.