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Image registration based on lifting process: an application to digital subtraction radiography

Journal article
Authors GK Matsopoulos
NA Mouravliansky
PA Asvestas
KK Delibais
Kerstin Gröndahl
Hans-Göran Gröndahl
Published in IEEE Trans Inf Technol Biomed
Volume 10
Issue 4
Pages 763-774
Publication year 2006
Published at Institute of Odontology
Pages 763-774
Language en
Subject categories Radiological research

Abstract

In this paper, a digital subtraction radiology scheme is presented based on a new method for the automatic registration of dental radiographs acquired with or without rigorous a priori standardization. The scheme is comprised of an automatic registration method and a subtraction process. The proposed registration method can be considered as an object-based registration method without imposing the prerequisite of image segmentation in order to detect the boundary of the objects of interest or the automatic detection of matching landmarks. This is achieved by augmenting the dimensionality of the problem from two-dimensional gray-level matching to three-dimensional surface matching using the process of lifting in combination with a surface-matching technique. The pseudo three-dimensional affine transformation that matches the lifted images incorporates advantageous characteristics including spatial alignment of the surfaces, anisotropic correction of brightness/contrast differences, and stable convergence of the similarity function to its optimal value. The performance of the proposed automatic registration method is assessed against a manual method based on the projective transformation. The qualitative and quantitative assessments of the experiments have shown advantageous performance of the proposed automatic registration method against the manual one. Finally, the proposed registration method has been further improved in terms of execution time by the implementation of a surface decimation process.

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