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Interactive soft tissue deformation ...

Wu, Wen.

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Interactive soft tissue deformation in surgical simulation.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Interactive soft tissue deformation in surgical simulation./
作者:	Wu, Wen.
面頁冊數:	127 p.
附註:	Adviser: Pheng Ann Heng.
Contained By:	Dissertation Abstracts International68-03B.
標題:	Computer Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3254545

Interactive soft tissue deformation in surgical simulation.
Wu, Wen.

Interactive soft tissue deformation in surgical simulation. - 127 p.

Adviser: Pheng Ann Heng.

Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2006.

Through the combination of these approaches, a physically based model which allows users to freely perform the soft tissue cutting and detecting, such as poking or dragging operations, with soft tissue deformation is achieved in real-time.Subjects--Topical Terms:

626642
Computer Science.

Interactive soft tissue deformation in surgical simulation.
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245 1 0 $a Interactive soft tissue deformation in surgical simulation.
300 $a 127 p.
500 $a Adviser: Pheng Ann Heng.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1745.
502 $a Thesis (Ph.D.)--The Chinese University of Hong Kong (Hong Kong), 2006.
520 $a Through the combination of these approaches, a physically based model which allows users to freely perform the soft tissue cutting and detecting, such as poking or dragging operations, with soft tissue deformation is achieved in real-time.
520 $a Surgical simulator, which benefits from virtual reality techniques, presents a realistic and feasible approach to train inexperienced surgeons within a safe environment. It plays more and more important role in medical field and also changes the world of surgical training. Especially, the minimally invasive microsurgery, which offers patients various attractive advantages over the traditional surgery, has been widely used in otolaryngology, gastroenterology, gynecology and neurology in the last two decades.
520 $a As a good and competent surgical simulator, it should provide surgeons with visual, tactile and behavioral illusion of reality. In literature, methods for object deformation range from non-physically based models to physically based models. Early works of non-physically based models focused on pure geometrical models that were originally employed in computer-aided design. These methods could be used to produce vivid deformable effects in computer animation. However, the soft tissue simulation in surgical applications requires more realistic models based on physical properties of human tissues. As a result, the mass-spring model and the finite element model have become the most popular representations for deformable organs in surgical simulation. Our research focuses on the real-time soft tissue deformable model based on the finite element method for surgical application.
520 $a In the thesis, new approaches to establish a physically based model for soft tissue deformation and cutting in virtual-reality-based simulators are proposed. A deformable model, called the hybrid condensed finite element model, based on the volumetric finite element method is presented. By this method, three-dimensional organs can be represented as tetrahedral meshes, divided into two regions: the operational region and the non-operational one. Different methods treat the regions with different properties in order to balance the computational time and the level of the simulation realism. The condensation technique is applied to only involve the calculation of the surface nodes in the non-operational region while the fully calculation of the volumetric deformation is processed in the operational part. This model guarantees the smooth simulation of cutting operation with the exact cutting path when users manipulate a virtual scalpel. Moreover, we discuss the relevant aspects on what affect the efficiency of implementing the finite element method, as well as the issues considered for choosing the effective solving method to our problem. Three numerical methods have been examined in our model.
520 $a Extended from the hybrid condensed finite element model, an interactive hybrid condensed model with hardware acceleration by the graphics processing unit (GPU) is proposed. Two methods are developed in order to map the data onto the GPU in accordance with the application data structure. The performance of the primary calculation task in the solver is enhanced. Furthermore, an improved scheme is presented to conduct the newly applied forces induced by dragging or poking operations in the non-operational region.
590 $a School code: 1307.
650 4 $a Computer Science. $3 626642
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710 2 $a The Chinese University of Hong Kong (Hong Kong). $3 1017547
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