title: Resolving intravoxel fiber architecture using nonconvex regularized blind compressed sensing.
abstract: In diffusion magnetic resonance imaging, accurate and reliable estimation of intravoxel fiber architectures is a major prerequisite for tractography algorithms or any other derived statistical analysis. Several methods have been proposed that estimate intravoxel fiber architectures using low angular resolution acquisitions owing to their shorter acquisition time and relatively low b-values. But these methods are highly sensitive to noise. In this work, we propose a nonconvex regularized blind compressed sensing approach to estimate intravoxel fiber architectures in low angular resolution acquisitions. The method models diffusion-weighted (DW) signals as a sparse linear combination of unfixed reconstruction basis functions and introduces a nonconvex regularizer to enhance the noise immunity. We present a general solving framework to simultaneously estimate the sparse coefficients and the reconstruction basis. Experiments on synthetic, phantom, and real human brain DW images demonstrate the superiority of the proposed approach.
authors.affiliation: HIT-INSA Sino French Research Centre fssor Biomedical Imaging, Harbin Institute of Technology, Harbin, People's Republic of China. CREATIS, CNRS UMR 5220, Inserm U630, INSA of Lyon, University of Lyon, Villeurbanne, France.
authors.forename: C Y
authors.initials: CY
authors.lastname: Chu
authors.forename: J P
authors.initials: JP
authors.lastname: Huang
authors.forename: C Y
authors.initials: CY
authors.lastname: Sun
authors.forename: W Y
authors.initials: WY
authors.lastname: Liu
authors.forename: Y M
authors.initials: YM
authors.lastname: Zhu
mesh_terms: D000465:Algorithms; D001921:Brain / Q000648:ultrastructure; D004058:Diffusion; D056324:Diffusion Tensor Imaging / Q000379:methods*; D006801:Humans; D019047:Phantoms, Imaging