规则数据场的三维医学体数据可视化研究
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摘要
本论文针对医学体数据,从科学可视化的角度出发,通过分析大量文献,重点研究了水平集的分割算法和基于分割的三维重建方法。论文所做的主要工作及创新成果包括:
     1.讨论了规则数据场、医学体数据可视化分割和三维重建技术的相关概念,分析了当前国内外的发展情况。
     2.对水平集分割进行研究,提出了水平集的快速行进法和窄带法相结合的图像分割算法,从规则的医学图像中准确地提取出目标组织器官,为接下来的三维重建做基础;与此同时,根据感兴趣区的特性和其所处的环境合理选取种子点,解决分割中对种子选取的瓶颈问题。
     3.根据规则的医学体数据,利用本文提出的分割方法,研究了基于分割的改进的Marching Cubes方法和基于颜色填充的光线投影体绘制方法,用实验表明,比传统的重建方法具有较高的可视化效果。
     4.仔细研究了国内外正在普遍使用的VTK(Visualization Toolkit)和ITK(insightsegmentation and registration Toolkit)开发工具包,并用VC++2005实现了我们提出的分割算法和三维重建方法,给出关键代码。
     5.用规则医学体数据,在Windows平台上,结合ITK、VTK研究出一套简单的医学可视化系统,该系统实现了三维显示、二维分割、虚拟切片显示、人机交互等功能,具有一定的后续研发参考价值。
This paper mainly studies the segmentation algorithm of Level Set and 3D reconstruction method for medical volume data through the analysis of lots of documents, which from the perspective of scientific visualization. The main work and the innovative achievements include:
     1. Discussing the related concepts of the regular data sets, the visualization of medical data segmentation and 3D reconstruction technology, analysis of the current developments at home and abroad.
     2. Considering the Level Set segmentation, a image segmentation algorithm combined the Fast-marching with the Narrow-band is developed, extract the organs accurately from the regular medical images. As a foundation of the next 3D reconstruction; Meanwhile, according to the district interested in the character and the environment in which its reasonable selection of seeds, which can solve the bottlenecks of seed selection.
     3. According to the regular medical data, use the segmentation method proposed in this paper, a improved Marching Cubes methods based on segmentation and Ray Casting Volume Rending methods based on the color-filled are proposed. The experiments show that it can be better than the traditional method of reconstruction.
     4. Research the VTK (Visualization Toolkit) and ITK (insight segmentation and registration Toolkit) which widely used at home and abroad, then achieve our segmentation algorithm and the 3D reconstruction methods with VC + +2005, given the key code.
     5. Using the regular medical volume data and the Windows platform, a simple medical visualization system is developed. The system achieved the functions of 3D visualization, 2D segmentation, virtual slices human-computer interaction and etc. It has some value of Follow-up research.
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