Work

Spatial Transformation of DWI Data Using Non-Negative Sparse Representation

Year: 2012

Type: article

Abstract: This paper presents an algorithm to transform and reconstruct diffusion-weighted imaging (DWI) data for alignment of micro-structures in association with spatial transformations. The key idea is to decompose the diffusion signal profile, a function defined on a unit sphere, into a series of weighted diffusion basis functions (DBFs), reorient these weighted DBFs independently based on the local affine transformation, and then recompose the reoriented weighted DBFs to obtain the final transformed diffusion signal profile. The decomposition is performed in a sparse representation framework in recognition of the fact that each diffusion signal profile is often resulting from a small number of fiber populations. A non-negative constraint is further imposed so that noise-induced negative lobes in the profile can be avoided. The proposed framework also explicitly models the isotropic component of the diffusion signals to avoid undesirable artifacts during transformation. In contrast to existing methods, the current algorithm allows the transformation to be executed directly in the signal space, thus allowing any diffusion models to be fitted to the data after transformation.

Source: IEEE Transactions on Medical Imaging

DOI: 10.1109/tmi.2012.2204766

Authors: Pew-Thian Yap, Dinggang Shen

Institution: University of North Carolina at Chapel Hill

Language: English

Topic: Advanced Neuroimaging Techniques and Applications

Subfield: Radiology, Nuclear Medicine and Imaging

Field: Medicine

Domain: Health Sciences

Open Access status: green

Funders: National Institute on Aging, National Institute of Mental Health, National Institute of Biomedical Imaging and Bioengineering