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Intensity-based hierarchical elastic registration using approximating splines
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 2562357
Author(s) Serifovic-Trbalic, Amira; Demirovic, Damir; Cattin, Philippe C
Author(s) at UniBasel Cattin, Philippe Claude
Year 2013
Title Intensity-based hierarchical elastic registration using approximating splines
Journal Computer assisted radiology and surgery
Volume 9
Number 1
Pages / Article-Number 21-7
Keywords Gaussian elastic body splines, Image registration, Deformation field approximation
Abstract We introduce a new hierarchical approach for elastic medical image registration using approximating splines. In order to obtain the dense deformation field, we employ Gaussian elastic body splines (GEBS) that incorporate anisotropic landmark errors and rotation information. Since the GEBS approach is based on a physical model in form of analytical solutions of the Navier equation, it can very well cope with the local as well as global deformations present in the images by varying the standard deviation of the Gaussian forces.The proposed GEBS approximating model is integrated into the elastic hierarchical image registration framework, which decomposes a nonrigid registration problem into numerous local rigid transformations. The approximating GEBS registration scheme incorporates anisotropic landmark errors as well as rotation information. The anisotropic landmark localization uncertainties can be estimated directly from the image data, and in this case, they represent the minimal stochastic localization error, i.e., the Cram,r-Rao bound. The rotation information of each landmark obtained from the hierarchical procedure is transposed in an additional angular landmark, doubling the number of landmarks in the GEBS model.The modified hierarchical registration using the approximating GEBS model is applied to register 161 image pairs from a digital mammogram database. The obtained results are very encouraging, and the proposed approach significantly improved all registrations comparing the mean-square error in relation to approximating TPS with the rotation information. On artificially deformed breast images, the newly proposed method performed better than the state-of-the-art registration algorithm introduced by Rueckert et al. (IEEE Trans Med Imaging 18:712-721, 1999). The average error per breast tissue pixel was less than 2.23 pixels compared to 2.46 pixels for Rueckert's method.The proposed hierarchical elastic image registration approach incorporates the GEBS approximation scheme extended with anisotropic landmark localization uncertainties as well as rotation information. Our experimental results show that the proposed scheme improved the registration result significantly.
Publisher Springer
Full Text on edoc No
Digital Object Identifier DOI 10.1007/s11548-013-0906-7
PubMed ID
ISI-Number WOS:000330585800003
Document type (ISI) Journal Article

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