Title :
Block-matching strategies for rigid registration of multimodal medical images
Author :
Commowick, Olivier ; Wiest-Daesslé, Nicolas ; Prima, Sylvain
Author_Institution :
INSERM, INRIA, Rennes, France
Abstract :
We propose and evaluate a new block-matching strategy for rigid-body registration of multimodal or multisequence medical images. The classical algorithm first matches points of both images by maximizing the iconic similarity of blocks of voxels around them, then estimates the rigid-body transformation best superposing these matched pairs of points, and iterates these two steps until convergence. In this formulation, only discrete translations are investigated in the block-matching step, which is likely to cause several problems, most notably a difficulty to tackle large rotations and to recover subvoxel transformations. We propose a solution to these two problems by replacing the original, computationally expensive, exhaustive search over translations by a more efficient optimization over rigid-body transformations. The optimal global transformation is then computed based on these local blockwise rigid-body transformations, and these two steps are iterated until convergence. We evaluate the accuracy, robustness, capture range and run time of this new block-matching algorithm on both synthetic and real MRI and PET data, demonstrating faster and better registration than the translation-based block-matching algorithm.
Keywords :
biomedical MRI; image registration; image sequences; medical image processing; optimisation; positron emission tomography; classical algorithm first matches points; discrete translations; local blockwise rigid-body transformations; multimodal medical imaging; multisequence medical imaging; optimal global transformation; real MRI data; real PET data; rigid-body registration; subvoxel transformations; synthetic MRI data; synthetic PET data; translation-based block-matching algorithm; Accuracy; Biomedical imaging; Magnetic resonance imaging; Mutual information; Optimization; Positron emission tomography; Robustness; MRI; block-matching; multimodal rigid-body registration; optimization;
Conference_Titel :
Biomedical Imaging (ISBI), 2012 9th IEEE International Symposium on
Conference_Location :
Barcelona
Print_ISBN :
978-1-4577-1857-1
DOI :
10.1109/ISBI.2012.6235644