Objective: This work evaluates current 3-D image registration tools on clinically acquired abdominal computed tomography (CT) scans.

Methods: Thirteen abdominal organs were manually labeled on a set of 100 CT images, and the 100 labeled images (i.e., atlases) were pairwise registered based on intensity information with six registration tools (FSL, ANTS-CC, ANTS-QUICK-MI, IRTK, NIFTYREG, and DEEDS). The Dice similarity coefficient (DSC), mean surface distance, and Hausdorff distance were calculated on the registered organs individually. Permutation tests and indifference-zone ranking were performed to examine the statistical and practical significance, respectively.

Results: The results suggest that DEEDS yielded the best registration performance. However, due to the overall low DSC values, and substantial portion of low-performing outliers, great care must be taken when image registration is used for local interpretation of abdominal CT.

Conclusion: There is substantial room for improvement in image registration for abdominal CT.

Significance: All data and source code are available so that innovations in registration can be directly compared with the current generation of tools without excessive duplication of effort.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4972188PMC
http://dx.doi.org/10.1109/TBME.2016.2574816DOI Listing

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