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Tracking discrete off-resonance markers with three spokes (trackDOTS) for compensation of head motion and B0 perturbations: accuracy and performance in anatomical imaging

Jorge, Joao, Gretsch, Frederic, Gallichan, Daniel and Marques, Jose P. 2018. Tracking discrete off-resonance markers with three spokes (trackDOTS) for compensation of head motion and B0 perturbations: accuracy and performance in anatomical imaging. Magnetic Resonance in Medicine 79 (1) , pp. 160-171. 10.1002/mrm.26654

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Abstract

Purpose: To develop a novel approach for head motion and B0 field monitoring based on tracking Discrete Off-resonance markers with Three Spokes (trackDOTS). Methods: Small markers filled with acetic acid were built and attached to a head cap. Marker positions and phase were tracked with fast MR navigators (DotNavs) comprising three offresonance, double-echo orthogonal 1D-projections. Individual marker signals were extracted using optimized coil combinations, and used to estimate head motion and field perturbations. To evaluate the approach, DotNavs were integrated in sub-millimeter MP2RAGE and long-TE GRE sequences at 7T, and tested on six healthy volunteers. Results: DotNav-based motion estimates differed by less than 0.11±0.09mm and 0.19±0.17° from reference estimates obtained with an existing navigator approach (FatNavs). Retrospective motion correction brought clear improvements to MP2RAGE image quality, even in cases with sub-millimeter involuntary motion. DotNav-based field estimates could track deep breathinginduced oscillations, and in cases with small head motion, field correction visibly improved GRE data quality. Conversely, field estimates were less robust when strong motion was present. Conclusion: The trackDOTS approach is suitable for head motion tracking and correction, with significant benefits for high-spatial resolution MRI. With small head motion, DotNav-based field estimates also allow correcting for deep-breathing artifacts in T2 *-weighted acquisitions.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Cardiff University Brain Research Imaging Centre (CUBRIC)
Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: retrospective motion correction, B0 field monitoring, trackDOTS, navigators
Publisher: John Wiley & Sons
ISSN: 0740-3194
Date of First Compliant Deposit: 1 March 2017
Date of Acceptance: 3 February 2017
Last Modified: 05 Aug 2019 14:28
URI: http://orca.cf.ac.uk/id/eprint/98653

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