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Distortion correction of high b-valued and high angular resolution diffusion images using iterative simulated images

Title
Distortion correction of high b-valued and high angular resolution diffusion images using iterative simulated images
Authors
Nam H.Park H.-J.
Ewha Authors
남혜원
Issue Date
2011
Journal Title
NeuroImage
ISSN
1053-8119JCR Link
Citation
vol. 57, no. 3, pp. 968 - 978
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
High b-valued diffusion-weighted images (DWI), which were designed to solve fiber-crossing problems, are susceptible to many artifacts and distortions. Since DWIs with different diffusion gradients produce dissimilar intensity contrasts, and since the distortion is nonlinear when multiple artifactual sources are intermixed, the mutual information-based affine registration may not be adequate for precise correction of distortions in DWIs, especially for images acquired with high b-values. To overcome these problems, we proposed an iterative image registration technique through which simulated DWIs are generated, driven from a diffusion tensor estimate, as targets for measured DWIs in the registration. Since simulated DWIs have similar intensity profiles to those of measured DWIs and the same geometric profiles as b 0-images, an iterative procedure enables intensity-based nonlinear registration. As a pre-processing step, we also proposed a motion detection and sub-volume utilization for interleaved volumes. Performance evaluation with high b-valued DWIs for high angular resolution diffusion imaging and diffusion kurtosis imaging showed that the proposed method had a superior advantage over the conventional registration technique. © 2011 Elsevier Inc.
DOI
10.1016/j.neuroimage.2011.05.018
Appears in Collections:
연구기관 > 수리과학연구소 > Journal papers
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