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Shielding metallic interference for electromagnetic trackingsystems

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  • Shielding metallic interference for electromagnetic trackingsystems

    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

    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

    Peter Mills
    Biomechanics-Dynamics Group
    Griffith University

    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

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