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随着 MSCT 扫描技术的发展,薄层扫描图像被越来越多地应用于临床,由于薄层扫描图像具有更高的空间与时间分辨率,这为基于 CT 图像的虚拟内窥镜等后处理技术提供了更加广阔的应用前景.目前国内外对 CT 虚拟内窥镜的研究很多,尤其是在虚拟内窥镜的导航方法上存在一定的难度,目前的导航方法是:(1)采用 MPR 图像的二维导航方法;(2)采用预先计算的规定路径导航。上述两种方法均存在不足。本文提出了一种直接三维导航的方法.该方法采用了一种改进的三维自适应容积重建算法,在此基础上,跟踪观察视点在体数据场三维笛卡尔坐标系中的运动方向与轨迹,同时可以在 X、Y、Z 三个自由度上反映和控制其轨迹与方向的改变。文中采用上述方法实现了三维导航的 CT 虚拟内窥镜功能,应用结果表明,该方法比常规的方法具有优越性。
With the development of MSCT scanning technology, thin-layer scan images have been increasingly used in clinical applications. Because of the higher spatial and temporal resolution of thin-layer scan images, this is a post-processing of virtual endoscopes based on CT images. The technology provides a broader application prospect. At present, there are many researches on CT virtual endoscope at home and abroad, especially on the navigation method of virtual endoscopy. The current navigation methods are: (1) Using MPR images The two-dimensional navigation method; (2) Pre-calculated prescribed path navigation. Both of the above methods have deficiencies. This paper proposes a direct three-dimensional navigation method. This method uses an improved three-dimensional adaptive volume reconstruction algorithm. Based on this, it tracks the direction and trajectory of the viewpoint in the three-dimensional Cartesian coordinate system of the volume data field. At the same time, the changes in the trajectory and direction can be reflected and controlled on the three degrees of freedom of X, Y, and Z. In the article, the above-mentioned method is used to realize the CT virtual endoscopy function of three-dimensional navigation. The application results show that this method is superior to the conventional method.