| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 101 === In vertebroplasty surgery, the surgeons usually use two pieces of X-ray images for diagnosis and surgical planning. Because of the complicated geometry in spine, such information is usually not rich enough for decision making. During surgery, the surgeons inject bone cement into the center of the collapsed spinal vertebra to stabilize and strengthen the crushed bone. It is necessary for the surgeons to take plenty of C-arm images to realize the real time position and orientation of the tools as well as the cement. The increasing radiation exposure for this kind of surgery will probably bring the surgeons some diseases in the future. To assist the surgeons knowing the volume of the bone cement injected, this research intends to develop an auto-reduction of subsided vertebral. The idea is to deform collapsed vertebra into its normal shape, and then to use the volume difference as a bone cement perfusion reference. The proposed auto-reduction technique mainly contains the following features : (1)input patient 3D vertebral model, (2)compute the surface of vertebral body, (3)evaluate the objective surface of the deformed vertebral body, and (4)retain the origin al feature of the vertebra. In this study, several examples, including artificial models and real patient models, are employed to demonstrate the feasibility of the proposed method.
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