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Web-based VR Training Simulator for Percutaneous Rhizotomy. MMVR. 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.
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Web-based VR Training Simulator for Percutaneous Rhizotomy MMVR 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 • Motivation • Surgical procedure • The simulator • Conclusions
Motivation • The limitation of current VR training systems Dedicated, expensive equipment • The advantages of web based VR environment Accessible, scalable, low cost • It is possible VRML
Lesion Generator The Surgical Procedure - Percutaneous Rhizotomy Insert needle electrode at correct position & orientation on face Locate & puncture foramen ovale to access and burn ganglion nerve
Why is Simulation Useful • Highly skilled operation Especially to locate foramen ovale • Awkward to train new staff Patient awake for part of the procedure • Risky Dissection of carotid artery will affect blood supply to brain
Our Simulator • A simple web-based simulator • 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 Web Server download VRML world extended with Java EAI to provide simulation Browser 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 • Place landmarks • 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
Solution: Detect collision with eye of the needle electrode The Simulator-Hitting The Target • Collision detection between objects not supported in VRML Only collision with viewer
Conclusion • Client-based WWW surgical training system is fast, cheap, … • Collision detection between needle and multiple complex objects is efficient • Various surgical tasks have been simulated • Complexity versus ease of use ?