Web based vr training simulator for percutaneous rhizotomy
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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

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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


Success


Oops….


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 ?


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