（北京工業大學，電子信息與控制工程學院， 北京 100124）
摘  要：在虛擬手術系統中，軟體形變是當前的研究熱點之一，其應用的物理建模模型主要有質點-彈簧模型，有限元模型等。為縮短計算時間，提高實時性，在質點-彈簧模型的基礎上，提出了一種基于力反饋的局部動態質點-彈簧模型。在模型載入的預處理階段建立軟體各質點的網絡結構，發生碰撞時，檢測碰撞點，以碰撞點為原始點，快速搜索相關網絡，根據施加力度大小建立形變區域，計算形變區域中所有質點的位移狀態使軟體產生形變。該方法由于形變計算只涉及形變區域，并且在預處理階段建立質點的相關網絡，依據力度大小動態形成形變區域，所以提高了計算效率，更好的實現了軟體形變仿真。
關鍵詞：虛擬現實；軟組織形變；力反饋；局部動態質點-彈簧模型；
Local Dynamic mass-spring model in Virtual Surgery
Yang Hao，Zhang Ziming，Shi Yuanzheng，Xie Chengkai，Zhang Junwei
(Beijing University of Technology, Electronic Information and Control Engineering, Beijing, 100124, China)
Abstract：In surgery system, software deformation is one of the current research focus. It's physical modeling model has mass-spring model, finite element model and so on. The local dynamic mass-spring model based force back was proposed to reduce the computing time and improve the real-time. We create a software of the network structure for each dot in the pretreatment stage of the model is loaded, when the collision occurs, then detect the collision point and make the collision point to be the original point, quick search related network, establish the deformation zone according with the size of the applied efforts, calculate the displacement of all points in the deformation zone to make the software generates deformation. This method improves the computing efficiency and makes the software deformation simulation better because of calculating in deformation zone, establishing the point network in the preprocessing stage and dynamic forming the deformation zone according to the size of efforts. 
Key words：virtual surgery; tissue deformation; force feedback; local dynamic mass-spring model;

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作者簡介：
楊浩（1985-）男，山東泰安人，碩士在讀，研究方向：計算機應用