A Biomedical Application of the Polhemus FASTRAK System

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A Biomedical Application of the Polhemus FASTRAK
System

• Lindsay Pacuska ME 03
• Lisa DeMar EE 03

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Presentation Outline

• Human Movement Tracking Devices
• Polhemus System
• Dystonia
• Methods of Treatment
• Testing in Montpellier, France
• Effects of DBS
• Proposed Research
• Current Goals
• Remaining Goals
• Questions

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Human Movement Tracking Devices

• Inside-Out System
• Method of Selection
• Limitations
• Workspace
• Interface Circuitry
• Obtrusive

http//www.skilltechnologies.com/6dresearch.htm
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Polhemus System

• Developed in 1964 by Bill Polhemus
• Determines an objects position in 3D space
• First Application performed by Air Force
• Other Applications
• First Testing for Biomedical uses occurred in
  Past decade
• Software Packages

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Polhemus System Contd. (How it works)

• Components
• Transmitter, Sensors, Motion Capture Unit
• Interface
• Electromagnetic Field
• 6 Degrees of Freedom
• X, Y, Z, Azimuth, Elevation, and Roll

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Transmitter
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Sensors
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Motion Capture Unit
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Interface
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Dystonia

• Human Neurological Movement Disorder
• Causes
• Birth Trauma, Injuries, Lack of oxygen to the
  Brain, and Degenerative diseases
• Associated with bursts of electrical activity in
  the affected muscles

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Dystonia Contd.

• Inappropriate signaling or feedback in the Basal
  Ganglia
• Occurs during voluntary movement
• Movement differs from the intended pattern
• Quality and Severity varies with body position,
  specified task, emotional state,and level of
  consciousness

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Methods of Treatment

• Lesions
• Removing segments of the brain
• Deep Brain Stimulation
• Neurosurgical technique of implanting electrodes
  into the subcortial structures and stimulating
  electrically the neurotissues
• DBS Benefits Adjustable, requires minimal
  surgery

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Effects of DBS
Ed Cwalinski

• 1st Symptoms in 6th Grade (writers cramp)
• Full Blown symptoms in 10th Grade (tug of war
  between muscles)
• Surgery March 2000 and August 2000
• Youngest person in US to receive DBS
• Age- 18

http//www.post-gazette.com/healthscience/20010411
dystonia2.asp
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Testing in Montpellier,France

• Site Gui De Chauliac Hospital, Neurosurgery B
• Supervisors
• Dr. Anne Beuter, Universite de Montpellier I,
  Institut de Biologie
• Dr. Philippe Coubes, Universite de Montpellier I,
  Hopital Gui de Chauliac
• Professor Nicholas Krouglicof, Union College,
  Mechanical Engineering

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Proposed Research

• Study Explore the effect of manipulating pulse
  width during DBS in Dystonic Patients
• 10-15 patients receiving DBS
• Tested 6 times over 15 days
• Hands and arms are held horizontal for one minute

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Current Goals

• Understand the Polhemus System
• Verify possible biomedical applications
• Create a user-friendly interface
• Calibration /Accuracy Testing of device
• Simulation of experimental test conditions

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Remaining Goals

• Collect data from test patients
• Quantify motor responses to the applied stimuli
• Aide in the specific determination regarding the
  inclusion of the pulse width as a control
  parameter of a stimulator during DBS

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Questions

• ???