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目的:研究螺旋CT扫描图像的固定桥计算机三维重建的方法。方法:采用美国PQ6000型螺旋CT扫描机,自下颌颏部下缘开始至鼻骨底做连续横断超薄扫描,得到人牙齿的二维CT图像。应用图像处理与识别合成软件,读取二维CT图像数据文件,通过灰度分割方法对二维图像进行边缘提取,再利用三维表面重建算法对所截取的二维CT图像进行三维重建,最终获得固定桥的三维重建影像。结果:获得了包括牙齿、牙周膜、牙槽骨在内的下颌后牙三单位固定桥的三维有限元数学模型。模型可以根据要求任意进行旋转、缩放、透视、剖开等多种方式观察,并可以按照不同研究目的和要求对模型进行修改和调整。结论:基于螺旋CT扫描图像的固定桥计算机三维重建,可为有限元实体建模提供快捷、方便的方法。
Objective: To study the method of three-dimensional computer reconstruction of fixed bridge with spiral CT scan image. Methods: The PQ6000 spiral CT scanner from the United States started from the lower edge of the chin of the mandible to the end of the nasal bone to make continuous cross-sectional ultrathin scanning. The two-dimensional CT images of human teeth were obtained. Using the image processing and recognition synthesis software, reading the two-dimensional CT image data file, extracting the edge of the two-dimensional image by using the gray-scale segmentation method, and reconstructing the three-dimensional reconstruction of the two-dimensional CT image by the three-dimensional surface reconstruction algorithm, finally obtaining Three-dimensional reconstruction of fixed bridge image. Results: The three-dimensional finite element model of mandibular posterior fixed bridge including teeth, periodontal ligament and alveolar bone was obtained. The model can be rotated, scaled, perspectived, cut open and so on a variety of ways according to requirements, and can be modified and adjusted according to different research purposes and requirements. Conclusion: Three-dimensional reconstruction of a fixed bridge computer based on spiral CT scan images can provide a fast and convenient method for modeling solid-state finite element.