CT-MR Image Nonrigid Registration

G. Palos, N. Betrouni, M. Vermandel, V. Devlaminck, and J. Rousseau (France)


Mutual Information, Nonrigid Registration, OpticalFlow, CT/MRI Multimodality, Matching, Multiresolution.


Conformal radiotherapy is a therapeutic method requiring medical imaging, generally CT images to obtain Hounsfield number and electronic density data indications. The use of MRI simultaneously with CT imposes to deform CT images and superimpose them on MR images. The aim of this paper is to propose a nonridgid matching method between the two modalities (CT and MRI). The transformation model is defined by an optical flow registration algorithm, using mutual information as a similarity criterion.

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