基于CT数据的三维重构。提出采用VTK库进行医学数据的可视化。论文中重点研究了表面绘制和体绘制两种绘制方法。表面绘制采用移动立方体算法（Marching Cubes）实现，体绘制则用光线投射算法（Ray-casting）实现，并且通过比较两种算法的结果讨论了他们的特点。-Based on the three-dimensional reconstruction of CT data.Proposed using the VTK library of medical data visualization. The paper focuses on the drawing method of surface rendering and volume rendering two. Surface to draw using the marching cubes algorithm (Marching Cubes) to achieve volume rendering using ray casting algorithm (Ray-casting) to achieve, and compare the results of the two algorithms discussed their characteristics.