基于对称性的颌骨复位方法研究及应用

摘要

Fororal surgery of dislocated fracture jaw reconstruction, a broken jaw reconstruction method is presented to help doctors for preoperative planning and preparation. Firstly, marching cube algorithm is used to extract facet model from patient’s CT image data, then a sketch-based interactive segmentation method, which combines graph cut algorithm and SDF descriptor and Gaussian mixture models, is presented to allow doctors to segment broken jaw rapidly by simple strokes; at last reconstruction is realized automatically based on the craniofacial symmetry. This method accomplishes reconstruction by reposition of broken jaw so that it can fully keep important fracture information for doctors. The method has been applied in self-developed jaw reconstruction system; patient data from The First Affiliated Hospital of Anhui Medical University has been used for testing, the result demonstrates the effectiveness of this approach.%针对严重错位骨折的颌骨复位口腔外科手术，提出一种帮助医生进行术前规划和准备的破损颌骨复位方法。首先使用移动立方体(MC)算法从患者CT图像中提取颌骨的面片模型；然后结合图割算法、形状直径函数(SDF)描述子和混合高斯模型的交互式分割方法，允许医生通过简单的勾画快速分割出破损骨块；最后基于颌骨的对称性特性自动完成破损骨块复位。通过破损骨块复位完成颌骨模型重构，能完整保留对医生非常重要的骨折线信息。该方法已应用于自主开发的计算机辅助破损颌骨复位系统，并使用安徽医科大学附属医院的患者数据进行了测试，结果表明了该方法的有效性。