Luo Shouhua, Yan Yuling
School of Biological Science and Medical Engineering, Southeast University, Nanjing, Jiangsu, PR China.
Med Sci Monit. 2009 Aug;15(8):MT95-100.
Conventional fiberoptic laryngoscope may cause discomfort to the patient and in some cases it can lead to side effects that include perforation, infection and hemorrhage. Virtual laryngoscopy (VL) can overcome this problem and further it may lower the risk of operation failures. Very few virtual endoscope (VE) based investigations of the larynx have been described in the literature.
MATERIAL/METHODS: CT data sets from a healthy subject were used for the VL studies. An algorithm of preprocessing and region-growing for 3-D image segmentation is developed. An octree based approach is applied in our VL system which facilitates a rapid construction of iso-surfaces. Some locating techniques are used for fast rendering and navigation (fly-through).
Our VL visualization system provides for real time and efficient 'fly-through' navigation. The virtual camera can be arranged so that it moves along the airway in either direction. Snap shots were taken during fly-throughs. The system can automatically adjust the direction of the virtual camera and prevent collisions of the camera and the wall of the airway.
A virtual laryngoscope (VL) system using OpenGL (Open Graphics Library) platform for interactive rendering and 3D visualization of the laryngeal framework and upper airway is established. OpenGL is supported on major operating systems and works with every major windowing system. The VL system runs on regular PC workstations and was successfully tested and evaluated using CT data from a normal subject.
传统纤维喉镜可能会给患者带来不适，在某些情况下还会导致包括穿孔、感染和出血在内的副作用。虚拟喉镜（VL）可以克服这一问题，并且还可能降低手术失败的风险。文献中很少有基于虚拟内窥镜（VE）对喉部进行的研究描述。
材料/方法：来自一名健康受试者的CT数据集用于虚拟喉镜研究。开发了一种用于三维图像分割的预处理和区域生长算法。我们的虚拟喉镜系统采用了基于八叉树的方法，便于快速构建等值面。一些定位技术用于快速渲染和导航（飞行浏览）。
我们的虚拟喉镜可视化系统提供实时高效的“飞行浏览”导航。虚拟相机可以设置为沿气道的任一方向移动。在飞行浏览过程中拍摄了快照。该系统可以自动调整虚拟相机的方向，防止相机与气道壁碰撞。
建立了一个使用OpenGL（开放图形库）平台进行交互式渲染以及对喉部结构和上气道进行三维可视化的虚拟喉镜（VL）系统。OpenGL在主流操作系统上均受支持，并且可与每个主流窗口系统配合使用。该虚拟喉镜系统在普通PC工作站上运行，并使用一名正常受试者的CT数据成功进行了测试和评估。
