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Prospective and retrospective high order eddy current mitigation for diffusion weighted echo planar imaging
Author(s) -
Xu Dan,
Maier Joseph K.,
King Kevin F.,
Collick Bruce D.,
Wu Gaohong,
Peters Robert D.,
Hinks R. Scott
Publication year - 2013
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24589
Subject(s) - echo planar imaging , computer science , imaging phantom , distortion (music) , diffusion mri , artificial intelligence , diffusion , planar , computer vision , signal (programming language) , echo (communications protocol) , eddy current , algorithm , physics , magnetic resonance imaging , optics , medicine , telecommunications , radiology , amplifier , computer network , computer graphics (images) , bandwidth (computing) , quantum mechanics , programming language , thermodynamics
Purpose The proposed method is aimed at reducing eddy current (EC) induced distortion in diffusion weighted echo planar imaging, without the need to perform further image coregistration between diffusion weighted and T2 images. These ECs typically have significant high order spatial components that cannot be compensated by preemphasis. Theory and Methods High order ECs are first calibrated at the system level in a protocol independent fashion. The resulting amplitudes and time constants of high order ECs can then be used to calculate imaging protocol specific corrections. A combined prospective and retrospective approach is proposed to apply correction during data acquisition and image reconstruction. Results Various phantom, brain, body, and whole body diffusion weighted images with and without the proposed method are acquired. Significantly reduced image distortion and misregistration are consistently seen in images with the proposed method compared with images without. Conclusion The proposed method is a powerful (e.g., effective at 48 cm field of view and 30 cm slice coverage) and flexible (e.g., compatible with other image enhancements and arbitrary scan plane) technique to correct high order ECs induced distortion and misregistration for various diffusion weighted echo planar imaging applications, without the need for further image post processing, protocol dependent prescan, or sacrifice in signal‐to‐noise ratio. Magn Reson Med 70:1293–1305, 2013. © 2013 Wiley Periodicals, Inc.