| Project/Area Number |
10490024
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
広領域
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| Research Institution | Hiroshima City University |
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Principal Investigator |
FUJINO Seiji Hiroshima City University, Faculty of Information Sciences, Professor, 情報科学部, 教授 (40264965)
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| Co-Investigator(Kenkyū-buntansha) |
KOJIMA Akira Hiroshima City University, Faculty of Information Sciences, Research Assistant, 情報科学部, 助手 (80285428)
NAKAMURA Yasuaki Hiroshima City University, Faculty of Information Sciences, Professor, 情報科学部, 教授 (10264946)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1999: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Cataract / Operation / Virtural Reality / Simulation / Computer / Eyeball / バーチャル・リアリティー / ポリゴン / 可視化技術 |
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| Research Abstract |
This research project is concerned with the design and development of a virtual reality system for a Cataract operation. A realistic 3D eye surface model, integrated with an interactive incision, and deformable model for clouded content with a nucleus and a cortex in the lens are developed. The system can be used to perform the simulation of the cornea incision and absorption of clouded matter.
The 3D models of an iris, medical appliances, and the surface of an eye are created. The models are represented by polyhedra. Moreover the surface of an eye is mathematically represented by a part of a sphere. A shape of incision is also represented mathematically. The surface of eye is divided into a number of quadrants. Those divided quadrants, being approximated by plane quadrilaterals in 3D, present curved surfaces. The incision part on the eye surface is represented by removing the quadrilaterals corresponding to the incision part. The quadrilaterals on the spot are divided into minimum size
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quadrilaterals. Finally, the minimum size quadrilaterals in the supposed incised part are removed from the quad-tree.
A cataract eye has clouded content with nucleus and cortex parts. Depending on the level of the cataract, the weights of the connectivity between the dots are adjusted. The motion of a hand is detected with a sensor, and corresponds to the movement of the medical appliance. The average rendering time of a simulated absorption is approximately 0.16 seconds.
The virtual Cataract operation system introduced here can provide medical students with sufficient opportunities for practice. A quadtree based curved surface approximation method was proposed for this system. This method is beneficial for shortening the rendering speed. A mathematical model for visualizing an incision was also proposed. Using this model, the shape of an incision can be changed interactively in accordance with the movement of the medical appliance. The content model of a lens was also developed. We have a plan to have our system tested by ophthamologists. Less
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