Research Of Symmetry Based Dislocation Jaw Reconstruction Method And Application

It is a common oral surgery to reconstruct dislocation jaw. Jaw model, especially with fracture lines, can help doctor with adequate preoperative planning and shorten surgery time. With comprehensive utilization of medical image, computer graphics and 3D printing, this dissertation proposes a fast jaw reconstruction system and studies the key techniques. The work of this dissertation is as the following:1) The interactive method of bone segmentation based on strokes:This dissertation first uses Marching Cubes algorithm to reconstruct facet model from patient’s CT image data, then proposes a sketch-based interactive segmentation method, which combines Graph Cuts algorithm with SDF descriptor and Gaussian Mixture Models, which can allow doctors to segment broken jaw rapidly by simple strokes.2) Symmetry based method of dislocation jaw replacement:By pairing the sampling points of the mesh model, symmetry information can be obtained by local features, and reconstruction is realized automatically based on the craniofacial symmetry. This method accomplishes reconstruction by reposition of broken jaw, so fracture line information can be fully kept for doctors.3) Implementation and validation of dislocation jaw reconstruction software system: The involved key algorithms are presented in order to verify the validity of the methods, symmetry based jaw reconstruction system has been developed utilizing VTK, OpenGL and CGAL. Test results of the real data, which from The First Affiliated Hospital of Anhui Medical University, prove the convenience and effectiveness of this approach.