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題 名 | 全人工髖關節系統之三維網格建立法=Automated Three-Dimensional Finite-Element Meshing for Total Hip Prosthesis |
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作 者 | 林峻立; 張志涵; | 書刊名 | 中華醫學工程學刊 |
卷 期 | 17:4 1997.12[民86.12] |
頁 次 | 頁277-284 |
分類號 | 410.1644 |
關鍵詞 | 有限元素分析; 人工髖關節; 網格; Finite element analysis; Total hip prosthesis; Mesh; |
語 文 | 中文(Chinese) |
中文摘要 | 三維的有限元素分析能提供較精準的幾何外形, 複雜的材料特性及模擬較完整的 實際負荷,已成為當前骨科生物力學研究的主要趨勢。但也由於人體骨骼的複雜性,使得三 維模型的建立,成為一項費時、費力之工作,而造成了其應用上之限制。本研究利用電腦斷 層掃描的技術, 搭配 CAD 系統,發展出自動化之人工髖關節植入骨骼之三維有限元素模型 建立系統,同時藉由電腦斷層掃描原始資料可直接推導出元素的材料特性,以克服骨質非均 質的材料特性。首先利用影像處理軟體,以閾值自電腦斷層掃描( CT )數據中擷取股骨剖 面密度及輪廓。 再以 CAD 軟體建立人工髖關節莖的斷面輪廓並併入股骨影像以製造植入後 的虛擬 CT 影像。根據設定之元素大小將合併之斷面影像做等方格分割,然後移動骨骼及人 工髖關節莖輪廓邊緣處方格的頂點至最近之輪廓點上,加上輪廓內部之方格頂點即構成有限 元素節點( node )。同時為避免元素扭曲,輪廓上節點所形成之角度均予以檢測調整,直 到其滿足規定範圍。最後將上下相臨影像之相對應之節點利用四面體聯結形成三維元素。 |
英文摘要 | The finite element method (FEM) is a powerful tool in orthopaedic biomechanics. However, eveloping a 3-D mesh model in irregular geometry object is a labor intensive works hence limits the usage of the three dimensional approaches for bony objects. This study presents a automatic procedure to generate the three dimensional finite element model of femur and prosthesis system from CT slices and CAD system. Image processing, simulation of stem implantation, three dimensional automesh and determining the material properties are the major phase of this study. Firstly, CT scan is used as the raw input data. A self-developed image processing system was employed to detect the periosteal boundaries and endosteal boundaries of te femur. These femoral boundaries are transferred into a CAD system. A series of stem contours can be obtained and merged into the femoral boundaries within the CAD system. The mesh process is basically a moving nodes of uniform cube approach. The boundaries of each CT slice are superimposed by a uniform grid points. For grid points that are within half grid space of the boundaries, they will be moved to the nearest position of the boundaries. The grid points outside the periosteal boundaries will be discarded. The remaining grid points is then regarded as nodal points of the mesh. A cube will be formed from the corresponding grid points between two adjacent slices, and will be broken to generate the tetrahedral elements thus create the three-dimensional FE mesh. Finally, the material property of each element can be calculated from CT number by a cubic equation. |
本系統中英文摘要資訊取自各篇刊載內容。