title: Collaborative patch-based super-resolution for diffusion-weighted images.
abstract: In this paper, a new single image acquisition super-resolution method is proposed to increase image resolution of diffusion weighted (DW) images. Based on a nonlocal patch-based strategy, the proposed method uses a non-diffusion image (b0) to constrain the reconstruction of DW images. An extensive validation is presented with a gold standard built on averaging 10 high-resolution DW acquisitions. A comparison with classical interpolation methods such as trilinear and B-spline demonstrates the competitive results of our proposed approach in terms of improvements on image reconstruction, fractional anisotropy (FA) estimation, generalized FA and angular reconstruction for tensor and high angular resolution diffusion imaging (HARDI) models. Besides, first results of reconstructed ultra high resolution DW images are presented at 0.6×0.6×0.6 mm3 and 0.4×0.4×0.4 mm3 using our gold standard based on the average of 10 acquisitions, and on a single acquisition. Finally, fiber tracking results show the potential of the proposed super-resolution approach to accurately analyze white matter brain architecture.
authors.affiliation: Laboratoire Bordelais de Recherche en Informatique, Unité Mixte de Recherche CNRS (UMR 5800), Bordeaux, France. Electronic address: pierrick.coupe@gmail.com.
authors.forename: Pierrick
authors.initials: P
authors.lastname: Coupé
authors.forename: José V
authors.initials: JV
authors.lastname: Manjón
authors.forename: Maxime
authors.initials: M
authors.lastname: Chamberland
authors.forename: Maxime
authors.initials: M
authors.lastname: Descoteaux
authors.forename: Bassem
authors.initials: B
authors.lastname: Hiba
mesh_terms: D000465:Algorithms; D001921:Brain / Q000648:ultrastructure*; D063132:Connectome / Q000379:methods*; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D009413:Nerve Fibers, Myelinated / Q000648:ultrastructure*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
keywords: Diffusion tensor imaging (DTI); Diffusion-weighted imaging (DWI); High angular resolution diffusion imaging (HARDI); Nonlocal means; Patch-based method; Super-resolution; Ultra high resolution DWI/DTI/HARDI