The Research On Craniomaxillofacial Plastic Surgery Visualization And Operation Simulation

A system called "System for Cranio-maxillofacial Plastic Surgery Visualization and Operation Simulation (3DCMFCAS)"for cranio-maxillofacial surgery for patients with facial malformations is presented. It is targeted at interactive visualization manipulation and measurement of multi-modality 3D medical images reconstructed from a series of 2D multi-modularity images such as CT\MRI\PET\DSA. It is designed to surgeons as a flexible computational support pre- intra- and post-operatively. It is being developed to specifically assist surgeon during canio- maxillofacial surgery. It will enable surgeons to locate the malformations, diagnose quantitatively and qualitatively prepare an accurate pre-operation planning, assess objectively of results of the surgery, obtain useful information by direct visualization of the full 3D context of the structures involved in the surgery, provide surgeons and physicians with powerful and flexible computational support for pre- surgical treatment planning, intra- and post- operatively evaluation. Thus minimizing the risks and resulting in reduction of morbidity and cost. In the paper, an introduction to significance and construction of the system ?DCMFCAS?is presented at first, and then the main work of this study: a discussion about three software packages related to the system, is followed in details. Comparing -5- volume rendering with surface rendering is discussed both in rendering quality and time consuming. Tow methods of surface rendering namely Point-based and Polygon-based used in the system are introduced, The Marching Cube(MC) algorithms and it's improvement is also discussed. Spatial manipulations and attribute control of objects is described. Especially osteotemy algorithm is emphasized in details. A new method, called 3D precision measurement is introduced. The algorithms of the measurement function included 3D-distance, 3D-area, and 3D volume measurements. Meantime, Post-operatively evaluation techniques is introduced and analyzed it's improvements. All of the above methods have been used in clinical and achieved excellent results.