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- Title
Simultaneous, multidirectional acquisition of displacement fields in magnetic resonance elastography of the in vivo human brain.
- Authors
Klatt, Dieter; Johnson, Curtis L.; Magin, Richard L.
- Abstract
<bold>Background: </bold>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. <bold>Methods: </bold>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. <bold>Results: </bold>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. <bold>Conclusion: </bold>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.
- Subjects
BRAIN anatomy; BRAIN physiology; ALGORITHMS; BIOMECHANICS; COMPARATIVE studies; DIAGNOSTIC imaging; ELASTICITY; MAGNETIC fields; RESEARCH methodology; MEDICAL cooperation; COMPUTERS in medicine; MOTION; RESEARCH; RESEARCH evaluation; RESEARCH funding; ULTRASONIC imaging; EVALUATION research; PHYSIOLOGY
- Publication
Journal of Magnetic Resonance Imaging, 2015, Vol 42, Issue 2, p297
- ISSN
1053-1807
- Publication type
journal article
- DOI
10.1002/jmri.24806