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Multiresolution-Based Registration of a Volume to a Set of Its Projections

S. Jonić, P. Thévenaz, M. Unser

Proceedings of the SPIE International Symposium on Medical Imaging: Image Processing (MI'03), San Diego CA, USA, February 17-20, 2003, vol. 5032, part II, pp. 1049-1052.

We have developed an algorithm for the rigid-body registration of a 3D CT to a set of C-arm images by matching them to computed cone-beam projections of the CT (DRRs). We precomputed rescaled versions (pyramid) of the CT volume and of the C-arm images. We perform the registration of the CT to the C-arm images starting from their coarsest resolution until we reach some finer resolution that offers a good compromise between time and accuracy. To achieve precision, we use a cubic-spline data model to compute the data pyramids, the DRRs, and the gradient and the Hessian of the cost function. We validate our algorithm on a 3D CT and on C-arm images of a cadaver spine using fiducial markers. When registering the CT to two C-arm images, our algorithm operates safely if the angle between the two image planes is larger than 10°. It achieves an accuracy of approximately 2.0±1.0 mm.

MI'03 Best Poster Award

AUTHOR="Joni{\'{c}}, S. and Th{\'{e}}venaz, P. and Unser, M.",
TITLE="Multiresolution-Based Registration of a Volume to a Set of
        Its Projections",
BOOKTITLE="Progress in Biomedical Optics and Imaging, vol. 4, no.
editor="Sonka, M. and Fitzpatrick, J.M.",
volume="5032, Part {II}",
series="Proceedings of the {SPIE} International Symposium on Medical
        Imaging: {I}mage Processing ({MI'03})",
address="San Diego CA, USA",
month="February 17-20,",
note="{Best poster award}")

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