An Optimized PatchMatch for multi-scale and multi-feature label fusion

Rémi Giraud (1, 2, 3) , Vinh-Thong Ta (1, 2) , Nicolas Papadakis (3) , Jose Vicente Manjon (4) , D Louis Collins (5) , Pierrick Coupé (1)

1 LaBRI - Laboratoire Bordelais de Recherche en Informatique
2 Bordeaux INP - Institut Polytechnique de Bordeaux
3 IMB - Institut de Mathématiques de Bordeaux
4 ITACA
5 MNI - McConnell Brain Imaging Centre

Automatic segmentation methods are important tools for quantitative analysis of Magnetic Resonance Images (MRI). Recently, patch-based label fusion approaches have demonstrated state-of-the-art segmentation accuracy. In this paper, we introduce a new patch-based label fusion framework to perform segmentation of anatomical structures. The proposed approach uses an Optimized PAtchMatch Label fusion (OPAL) strategy that drastically reduces the computation time required for the search of similar patches. The reduced computation time of OPAL opens the way for new strategies and facilitates processing on large databases. In this paper, we investigate new perspectives offered by OPAL, by introducing a new multi-scale and multi-feature framework. During our validation on hippocampus segmentation we use two datasets: young adults in the ICBM cohort and elderly adults in the EADC-ADNI dataset. For both, OPAL is compared to state-of-the-art methods. Results show that OPAL obtained the highest median Dice coefficient (89.9% for ICBM and 90.1% for EADC-ADNI). Moreover, in both cases, OPAL produced a segmentation accuracy similar to inter-expert variability. On the EADC-ADNI dataset, we compare the hippocampal volumes obtained by manual and automatic segmentation. The volumes appear to be highly correlated that enables to perform more accurate separation of pathological populations.

Mots clés: Segmentation; Patch-Based Method; Patch Matching; Late Fusion; Hippocampus

Domaines: Informatique [cs]; Vision par ordinateur et reconnaissance de formes [cs.CV]; Traitement des images [eess.IV]; Imagerie médicale

Rémi Giraud, Vinh-Thong Ta, Nicolas Papadakis, Jose Vicente Manjon, D Louis Collins, et al.. An Optimized PatchMatch for multi-scale and multi-feature label fusion. NeuroImage, 2016, 124, pp.770-782. ⟨10.1016/j.neuroimage.2015.07.076⟩. ⟨hal-01198703⟩