Transcript Document 7675904

Web-based VR Training Simulator
for Percutaneous Rhizotomy
Ying Li, Ken Brodlie and Nicholas Phillips *
http://www.scs.leeds.ac.uk/vis/ying/
School of Computer Studies, University of Leeds, UK
* Department of Neurosurgery, Leeds General Infirmary, UK
January 29, 2000
Contents
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Motivation
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Surgical procedure
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The simulator
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Conclusions
Motivation
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The limitation of current VR training systems
Dedicated, expensive equipment
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The advantages of web based VR environment
Accessible, scalable, low cost
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It is possible
The Surgical Procedure Percutaneous Rhizotomy
Lesion Generator
Insert needle electrode at
correct position &
orientation on face
Locate & puncture foramen
ovale to access and burn
ganglion nerve
Why is Simulation Useful
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Highly skilled operation
Especially to locate foramen ovale
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Awkward to train new staff
Patient awake for part of the procedure
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Risky
Dissection of carotid artery will affect blood supply to brain
Our Simulator
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A simple web-based simulator
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Aims to be an adjunct to training of neurosurgeons
Shorten period of training
Understanding of procedure and risks involved
The Simulator •
Architecture
Client-based system
Download self-contained
simulation to client
VRML world extended with
Java EAI to provide simulation
Single download,
no dependency on
network
The Simulator •
Virtual World
Extend reality by multiple views
From the eye of the surgeon
From the eye of the needle electrode
Eye of the surgeon
Eye of the needle
Java EAI
The Simulator - Simulating The Surgical Practice
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Place landmarks
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Virtual planes
The Simulator - Manipulating The Tools
• Controller
• Rotate and translate
according to rules of
surgical procedure
• Three VRML worlds
co-ordinated
through Java
EAI
The Simulator - Hitting The Target
• Collision detection between
objects not supported in VRML
Only collision with viewer
• Solution:
Detect collision with eye
of the needle electrode
Success
Oops….
Conclusion
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Client-based WWW surgical training
system is fast, cheap, …
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Collision detection between needle and
multiple complex objects is efficient
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Various surgical tasks have been simulated
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Complexity versus ease of use ?