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pmills42
09-18-2001, 10:19 PM
Hi all,

I am currently trying to collect some kinematic data from subjects
walking on a treadmill using an electromagnetic tracking system
(Fastrak hardware with 6D Research software). The problem is that
the metal frame of the treadmill distorts the coordinates. I have
tried using a compensation mapping program (SKMapper) that
theoretically corrects for the metallic distortion, however in some
sensor positions the the corrected coordinates are still distorted.
As expected, the worst distortion is of the foot sensor coordinates.
I have tried moving the transmitter around the treadmill without
success.

Could anyone suggest a solution to this problem?

Could there be a way to shield the metallic frame of the treadmill
so that it does no interfere with the system?

Any responses whether they are from personal experience or from
a theoretical perspective would be appreciated.


Thanks in advance, I will post a summary of replies within a
fortnight.

Peter Mills
Biomechanics-Dynamics Group
Griffith University
Australia




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Peter Mills
Biomechanics-Dynamics Group
School of Physiotherapy and Exercise Science
Griffith University - Gold Coast
PMB 50 Gold Coast Mail Centre 9726
Queensland Australia
Ph: +61 7 5552 8357
Fax: +61 7 5552 8674
Email: p.mills@mailbox.gu.edu.au

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