In order to resolve the image registration problem in X-ray nondestructive testing, a new computerized tomography image registration algorithm based the mathematical relationship between the parts displacement and the change of the projection data was proposed. The algorithm preprocesses the projection data considering the practical computed tomography system, and utilizes the correlation between the projection data to search for the parts displacement. The algorithm can deal with registration problem of the two dimensional rigid transformation in the parallel and fan beam geometry. Because the proposed algorithm is done in the projection field before image reconstruction, it is more adaptive comparing with the conventional registration algorithms in the image field. Especially when the projection quality is low, there is missing projection and high level noise and there are severe artifacts in the reconstructed images, the proposed algorithm is more effective and reliable. The registration results of a sealed apparatus verify the performance of the algorithm.
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