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Med Image Anal. 2002 Sep;6(3):191-8.

Distortion correction and robust tensor estimation for MR diffusion imaging.

Author information

1
Service Hospitalier Frédéric Joliot, CEA, 91401 Orsay, France. mangin@shfj.cea.fr

Abstract

This paper presents a new procedure to estimate the diffusion tensor from a sequence of diffusion-weighted images. The first step of this procedure consists of the correction of the distortions usually induced by eddy-current related to the large diffusion-sensitizing gradients. This correction algorithm relies on the maximization of mutual information to estimate the three parameters of a geometric distortion model inferred from the acquisition principle. The second step of the procedure amounts to replacing the standard least squares-based approach by the Geman-McLure M-estimator, in order to reduce outlier-related artefacts. Several experiments prove that the whole procedure highly improves the quality of the final diffusion maps.

PMID:
12270226
[Indexed for MEDLINE]

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