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GEOMETRIC PROPERTIES OF THE 3D SPINE CURVE

STRUCTURED LIGHT: Range retrieval method alternative to stereo imaging.. This method allows the surface reconstruction in objects without texture.Makes it easier to solve the stereo correspondence problem.. Pros:. A light source with a known pattern is utilised instead of a camera. A set of lan

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GEOMETRIC PROPERTIES OF THE 3D SPINE CURVE

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    1. GEOMETRIC PROPERTIES OF THE 3D SPINE CURVE J.M. Sotoca1, M. Buendía2, J.M. Iñesta3 and F.J. Ferri4 1 Dpto. Lenguajes y Sistemas Informáticos. Universidad Jaume I. 2 Dpto. Fisiología. Universidad de Valencia. 3 Dpto. Lenguajes y Sistemas Informáticos. Universidad de Alicante. 4 Dpto. Informática. Universidad de Valencia.

    2. STRUCTURED LIGHT: Range retrieval method alternative to stereo imaging. This method allows the surface reconstruction in objects without texture. Makes it easier to solve the stereo correspondence problem.

    10. STUDY OF THE FRONT AND SAGITTAL PLANES: Thoracic scoliosis. The Cobb angle is 45.0? in the thoracic region. Projection of the spine curve for front X-ray image over back surface. The lateral asymmetry in the front plane is 41.7? in the thoracic region and 19.4? in the lumbar region. The kyphosis angle is 53.9? and the lordosis angle is 47.5?.

    12. STUDY OF THE SPINE CURVE IN 3D: Curvature and torsion. C(u) : [pi, pi+1] ??3 is a parameterisation of the spine curve by mean of a polynomial fitting. Px and Pz are the coefficients of the polynomial using a threshold in the corresponding correlation index, and nx y nz are the degrees of the polynomial, The curvature ? and the torsion ? can be calculated from an arbitrary parametric curve through the following expressions:

    14. EXPERIMENTS AND RESULTS. A sample of 76 patients (42 female and 36 male). A group of 12 patients, aged from 11 and 18 years, had an idiopathic scoliosis process. The Ponsetti-Friedman classification: 4 thoracic, 2 thoraco-lumbar, 1 lumbar and 5 double major curves. The correlation index obtained between the lateral asymmetry in the spine curve obtain with landmarks and the Cobb angle obtain by means of front X-ray image was r = 0.89. The values for the kyphosis and lordosis angles for a group of 30 normal subjects were 44.5?11.8 and 34.1?10.0 degrees for male and 46.1?11.6 and 39.1?12.6 degrees for female.

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