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Simultaneous, multidirectional acquisition of displacement fields in magnetic resonance elastography of the in vivo human brain
Author(s) -
Klatt Dieter,
Johnson Curtis L.,
Magin Richard L.
Publication year - 2015
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.24806
Subject(s) - magnetic resonance elastography , elastography , materials science , scanner , spiral (railway) , displacement (psychology) , magnetic resonance imaging , reproducibility , biomedical engineering , nuclear magnetic resonance , acoustics , physics , medicine , mathematics , radiology , optics , ultrasound , psychology , mathematical analysis , statistics , psychotherapist
Background To implement a multidirectional motion encoding scheme for magnetic resonance elastography (MRE) of the human brain with reduced acquisition time, and investigate its performance relative to a conventional MRE scheme. Methods The sample interval modulation (SLIM) scheme was implemented in a multishot, variable density spiral MRE sequence. The brains of seven healthy volunteers were investigated with both SLIM‐MRE and conventional MRE acquisitions in a single imaging session on a clinical 3 Tesla MRI scanner with 50 Hz vibration. Following extraction of displacement fields, complex shear modulus property maps were estimated for each encoding concept. Results The SLIM‐MRE and conventional MRE acquisitions produced deformation fields that were nearly identical and exhibited an average correlation coefficient of 0.95 (all p < 0.05). Average properties of white matter differed between the two acquisitions by less than 5% for all volunteers, which is better than reproducibility estimates for conventional MRE alone. Conclusion The use of SLIM provides very similar quantitative property estimates compared with the conventional MRE encoding scheme. The SLIM acquisition is 2.5 times faster than the conventional acquisition, and may speed the adoption of MRE in clinical settings. J. Magn. Reson. Imaging 2015;42:297–304.