New approach to evaluate rotation of cervical vertebrae

Matthias Hahn

doi:10.1117/12.431056

3 July 2001 New approach to evaluate rotation of cervical vertebrae

Matthias Hahn

Proceedings Volume 4322, Medical Imaging 2001: Image Processing; (2001) https://doi.org/10.1117/12.431056
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

Functional deficits after whiplash injury can be analyzed with a quite novel radiologic method by examination of joint-blocks in C0/1 and C1/2. Thereto the movability of C0, C1 and C2 is determined with three spiral CT-scans of the patient's cervical spine. One series in neutral and one in maximal active lateral right and left rotation each. Previous methods were slice based and time consuming when manually evaluated. We propose a new approach to a computation of these angles in 3D. After a threshold segmentation of bone tissue, a rough 2D classification takes place for C0, C1 and C2 in each rotation series. The center of an axial rotation for each vertebra is gained from the approximation of its center of gravity. The rotation itself is estimated by a cross-correlation of the radial distance functions. From the previous rotation the results are taken to initialize a 3D matching algorithm based on the sum of squared differences in intensity. The optimal match of the vertebrae is computed by means of the multidimensional Powell minimization algorithm. The three translational and three rotational components build a six-dimensional search-space. The vertebrae detection and rotation computation is done fully automatic.

Citation Download Citation

Matthias Hahn "New approach to evaluate rotation of cervical vertebrae", Proc. SPIE 4322, Medical Imaging 2001: Image Processing, (3 July 2001); https://doi.org/10.1117/12.431056

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