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Re: tracking head movement

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  • Re: tracking head movement


    In response to your recent posting on tracking the head position.

    We are a Gait laboratory interested in all segmental movements during
    walking. Recently, we have added head postion (tilt, lateral flexion,
    and rotation) to our list. We are using a Motion Analysis 3-D
    high-speed video system with 6 cameras operating at 60 Hz to capture a
    full body set of retro-reflective markers. We use 3 markers arranged
    on a baseball cap: one anterior, one top, and one posterior on the
    midline of the head. We align the hat so that when the patient is
    relaxed and looking forward, the line formed by the anterior and
    posterior markers is parallel to floor. We call this neutral position.
    We then create a coordinate system from the 3 markers and reference the
    orientation of this system to our room system and the local system fixed
    to the trunk.

    We are using a program called Orthotrak 4.1 (Motion Analysis Corp.),
    which automatically performs the above calculations.

    Hope this helps,


    Patrick W. Castagno
    Manager/Biomechanist - Gait Analysis Laboratory
    duPont Hospital for Children
    1600 Rockland Road
    Wilmington, DE 19899

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