Comparison of EPI Distortion Correction Methods in Diffusion Tensor MRI Using a Novel Framework

Authors:
Minjie Wu;Lin-Ching Chang;Lindsay Walker;Herve Lemaitre;Alan S. Barnett;Stefano Marenco;Carlo Pierpaoli
Affiliations:
National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, USA and Dept. of Electrical and Computer Engineering, University of Pittsburgh, Pittsburgh, USA;Dept. of Electrical Engineering and Computer Science, Catholic University of America, Washington, USA;National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, USA;National Institute of Mental Health, National Institutes of Health, Bethesda, USA;National Institute of Mental Health, National Institutes of Health, Bethesda, USA;National Institute of Mental Health, National Institutes of Health, Bethesda, USA;National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, USA
Venue:
MICCAI '08 Proceedings of the 11th International Conference on Medical Image Computing and Computer-Assisted Intervention, Part II
Year:
2008

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Abstract

Diffusion weighted images (DWIs) are commonly acquired with Echo-planar imaging (EPI). B0 inhomogeneities affect EPI by producing spatially nonlinear image distortions. Several strategies have been proposed to correct EPI distortions including B0field mapping (B0M) and image registration. In this study, an experimental framework is proposed to evaluation the performance of different EPI distortion correction methods in improving DT-derived quantities. A deformable registration based method with mutual information metric and cubic B-spline modeled constrained deformation field (BSP) is proposed as an alternative when B0mapping data are not available. BSP method is qualitatively and quantitatively compared to B0M method using the framework. Both methods can successful reduce EPI distortions and significantly improve the quality of DT-derived quantities. Overall, B0M was clearly superior in infratentorial regions including brainstem and cerebellum, as well as in the ventral areas of the temporal lobes while BSP was better in all rostral brain regions.