光线投射算法在肝CT图像三维可视化中的应用

3D Visualization of Liver CT Series Image Using Ray-casting Algorithm

肝脏CT图像的三维可视化具有重要的科研价值和实用意义。直接体绘制技术已经成为三维体数据集可视化的一种重要方法。光线投射算法是一种实现原理相对简单且绘制结果精确可靠的体绘制算法,但传统算法绘制速度较慢。综合研究了现有的主要优化技术:感兴趣区域划分、空间跳跃技术及体素分类的快速三线性插值的思想,加速了光线投射算法,实现了对肝CT图像三维重建。

The visualization of liver CT series image volume data is important to scientific research and practical use. Direct volume rendering is an important method of 3D volume data visualization. As a volume rendering algorithm, Ray-casting Algorithm is easy to realize and its principle is rather simple. However, the rendering speed of traditional Ray-casting Algorithm is very slow. In this paper, we used three existed accelerating techniques： ROI division, space leaping, and the thesis of fast Tri-Linear interpolation based on voxel classified to accelerate Ray-casting Algorithm, and accomplished the 3d reconstruction of liver CT series image.