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3D axis system by four points on the human body ?

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  • 3D axis system by four points on the human body ?


    I'm assistant at the Ghent University. Currently we are doing research with
    the Zebris system. With this system we can measure some points in space via
    ultrasound. When we are doing our tests, we have to set the measuring sensor
    ( what is also our origin of the coordinate axis system) aligned with the
    patient, because otherwise we can't say that the angles we measure are for
    example in the sagittal plane ( or frontal, or transverse ). What I want to
    know is, does anyone have an idea of points on the human body, that are
    simply palpable. I need four points on the human body, and with these four
    points it must be possible to define an origin with an orthogonal axis
    system, where the axes are in the different planes of the body ( i.e.
    sagittal, frontal and transverse ). If this is possible with these four
    points, we can do a mathematical transformation from the original
    coordinate system ( i.e. our measuring sensor ) to the new coordinate system
    ( i.e. defined by our four points ). If that is possible we don't have to
    align the measuring sensor very precisely ( --> less errors ), what means
    that our measurements will be measured in the correct planes. I hope I have
    expressed me well enough to give a good explanation of our problem and I'm
    waiting for your replies ... Thanks in advance !

    Greetings from Belgium,

    Pascal Coorevits
    Ghent University - Faculty of Medicine
    Dpt. of Rehabilitation Sciences and Physical Therapy
    University Hospital
    De Pintelaan 185 - B-9000 Ghent
    Tel. : 0032-9-2402632
    Fax : 0032-9-2403811

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