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Prospective motion correction of segmented diffusion weighted EPI
Author(s) -
Herbst Michael,
Zahneisen Benjamin,
Knowles Benjamin,
Zaitsev Maxim,
Ernst Thomas
Publication year - 2015
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.25547
Subject(s) - sensitivity (control systems) , encoding (memory) , diffusion , computer science , diffusion mri , motion (physics) , computer vision , artificial intelligence , image quality , weighting , signal (programming language) , motion compensation , physics , magnetic resonance imaging , image (mathematics) , acoustics , medicine , radiology , electronic engineering , engineering , thermodynamics , programming language
Purpose Recently, a new algorithm was introduced to combine segments of under‐sampled diffusion weighted data using multiplexed sensitivity encoding. While the algorithm provides good results in cooperative volunteers, motion during the data acquisition is not accounted for. In this work, the continuous prospective motion correction of a segmented diffusion weighted acquisition is combined with multiplexed sensitivity encoding. Methods Simulations investigate the influence of motion on the reconstruction. Additionally, the change in coil sensitivities due to patient motion is taken into consideration. Finally, in vivo experiments display the effects of motion and its prospective correction on high resolution diffusion weighted imaging. Results Inconsistencies of the imaging plane lead to artifacts and blurring in the reconstructed dataset. Additionally, motion during the diffusion weighting period can lead to substantial image artifacts and signal dropouts. The change in coil sensitivities shows minor effect for the simulated range of motion (5°). Prospective motion correction is shown to improve image quality in the case of large motion (5°) and to reliably correct for small motion (1°). Conclusion The combination of prospective motion correction and multiplexed sensitivity encoding allows for high resolution diffusion weighted imaging even in the presence of substantial head motion. Magn Reson Med 74:1675–1681, 2015. © 2014 Wiley Periodicals, Inc.