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Correction of eddy current distortions in high angular resolution diffusion imaging
Author(s) -
Zhuang Jiancheng,
Lu ZhongLin,
Vidal Christine Bouteiller,
Damasio Hanna
Publication year - 2013
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.23929
Subject(s) - distortion (music) , diffusion , eddy current , resolution (logic) , imaging phantom , angular resolution (graph drawing) , image resolution , translation (biology) , image (mathematics) , physics , computer science , optics , computer vision , artificial intelligence , mathematics , chemistry , amplifier , biochemistry , optoelectronics , cmos , quantum mechanics , combinatorics , messenger rna , gene , thermodynamics
Purpose: To correct distortions caused by eddy currents induced by large diffusion gradients during high angular resolution diffusion imaging without any auxiliary reference scans. Materials and Methods: Image distortion parameters were obtained by image coregistration, performed only between diffusion‐weighted images with close diffusion gradient orientations. A linear model that describes distortion parameters (translation, scale, and shear) as a function of diffusion gradient directions was numerically computed to allow individualized distortion correction for every diffusion‐weighted image. Results: The assumptions of the algorithm were successfully verified in a series of experiments on phantom and human scans. Application of the proposed algorithm in high angular resolution diffusion images markedly reduced eddy current distortions when compared to results obtained with previously published methods. Conclusion: The method can correct eddy current artifacts in the high angular resolution diffusion images, and it avoids the problematic procedure of cross‐correlating images with significantly different contrasts resulting from very different gradient orientations or strengths. J. Magn. Reson. Imaging 2013;37:1460–1467. © 2012 Wiley Periodicals, Inc.