基于点消除及三次样条平滑的结肠虚拟内窥镜中心路径提取

The Central Path Extraction of Virtual Colonoscopy Based Points Decimating and Cubic Spline Interpolation

目的:结肠虚拟内窥镜模拟光学内窥镜将CT图像重建后在数字结肠空腔内的导航,结肠虚拟内窥镜的中心路径提取和导航是虚拟内窥镜研究的核心内容。方法:本文基于常用的基于边界距离场(DFB)方法和最大代价生成树方法提取出结肠的中心路径,对于这两种方法存在的提取时间长以及提取路径光滑性差的缺点,本文采用了中心点消减、三次样条平滑等手段来提高结肠中心路径提取的速度并改善提取路径的光滑性。结果:通过对多组实验数据的结果分析表明,本文提出的基于点消除及三次样条平滑方法不但明显缩短了中心路径的提取时间而且显著改善了结肠虚拟中心路径的平滑性。结论:本文方法能够快速、精确的实时提取出结肠的中心路径,是对基于边界距离场和最大代价生成树方法的极大改进,适合应用于结肠虚拟内窥镜的开发应用。

Objective： Colonoscopy reconstruction the CT images and navigation in the digital colon cavity as optic endoscope. The extraction of central path is key issue for colon virtual endoscope.Methods： Based on the common boundary distance field （DFB） method and the maximum cost spanning tree method extracts center path for colon,with the two drawbacks of long time extraction and short of smooth of the center path,this article based on points decimating and cubic spline interpolation,the fast and a smooth colon center path extraction is achieved to improve the distance from boundary（DFB） method.Results： Experiment with much test data shows the validity of the proposed method.Conclusions： The proposed method fast and accurate extracted the colonic center path real-timely,is a great improvement of based on boundary distance of fields and the maximum cost spanning tree method,suitable for the application of virtual colonoscopy.