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Thesis Presentation

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Mitchell Just

on 5 November 2013

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Transcript of Thesis Presentation

Mitchell Just
Immersive Virtual Reality Applications
for Post-Stroke Motor Rehabilitation

Title: Immersive Virtual Reality Applications
for Post-Stroke Motor Rehabilitation

Presenter: Mitchell Just

Supervisor: David Stirling

Subject: ECTE458
A Stroke is the rapid loss of brain function caused by disturbances in the blood supply to the brain
A blockage forms which restricts blood flow
Affected cortical sections begin to die, leading to permanent neurological damage
What is a Stroke?
Current Rehabilitation Techniques
(and why they work!)
The Use of Virtual Reality for Motor Rehabilitation
Videos!
Figure (a) shows no damage
Figure (b) shows a lesion
Effects of Stroke on the Individual
Effects of Stroke on Society
Project Overview
Presentation Overview
Develop framework for creation of virtual-reality rehabilitation applications
The framework must stream positional data from Xsens MVN Biomech Inertial Motion suit in real-time
This project will use post-stroke motor rehabilitation as a basis for the applications
Most common physical ailments are:
Loss of motor function
Uncoordination
Spasticity
Post-Stroke Depression affects 50% of stroke victims, responsible for reduced rehabilitation effectiveness
420,000 people in Australia living with effects of stroke, $602M in rehabilitation costs
66% require assistance to perform daily functions
75% experience significant decrease in employability
Significant need for improvement of conventional rehabilitation techniques!
Constraint Induced Movement Therapy
Forcing patient to use affected limb(s)
More usage = more synaptogenesis = more recovery
Brain Plasticity
Not the whole story!
Formation of new synapses (links) in the brain
Create new links and remap brain after damage
Other cortical sections can be recruited to perform tasks of damaged section
Repetitive task-specific actions induce more synaptogenesis
Questions?
Jang SH, You SH, Hallett M, Cho YW, Park CM, Cho SH, Lee HY, Kim TH. Cortical reorganization and associated functional motor recovery after virtual reality in patients with chronic stroke: an experimenter blind preliminary study. Arch Phys Med Rehabil. 2005;86: 2218–2223.
Immersive VR based rehabilitation have been shown to produce significantly better results than traditional exercises
Patients enjoy the training more, and are more likely to exercise more often, for longer periods and more vigorously
Being able to see how they are progressing gives patients more motivation
Project Plan
Oculus Rift HMD
Results
Develop easy to use framework for rendering model in real-time in an immersive virtual environment
Stream Inertial Motion suit data into Unity and map to character model in real-time
Integrate Oculus Rift HMD
Create sample applications to demonstrate the capabilities of the framework
Motion Data
Unity Engine
The Oculus Rift has direct out of the box integration with Unity
Adds unparalleled immersion
Results
Data is being streamed from the suit to Unity
Unity converts the byte-stream into quaternion rotations to manipulate an avatar
Oculus Rift support added
Scripts written to easily integrate with motion data
Sample applications written
UDP
Oculus SDK
Xsens MVN Biomech Intertial Motion Suit
17 Tracking sensors
Wireless transmission
No occlusion problems
Post-Stroke Depression
Affects 50% of stroke victims within the first year
VR + Post-Stroke Depression
VR systems have been shown to increase motivation and enjoyment in multiple studies
The ability to track usage will allow therapists to track diminished motivation, indicating a precursor for post-stroke depression
Clear correlation with reduced rehabilitation effectiveness
Primary indicator is "low mood or diminished interest in almost all activities"
Regularly under-diagnosed
Mirror-Box Simulation
Mirror right arm across the body
Simulates traditional mirror-box therapy
User sees correct motion occurring
Pathways are rebuilt in the brain
Range-Of-Motion Game
Simulates constraint induced motion therapy
Force the use of affected limb
Repetitive motion and pushing limits leads to recovery
Make traditional training technique seem less like rehabilitation
Full transcript