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In vivo brain viscoelastic properties measured by magnetic resonance elastography
Author(s) -
Green Michael A.,
Bilston Lynne E.,
Sinkus Ralph
Publication year - 2008
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.1254
Subject(s) - magnetic resonance elastography , elastography , in vivo , imaging phantom , white matter , magnetic resonance imaging , biomedical engineering , viscoelasticity , nuclear magnetic resonance , grey matter , materials science , nuclear medicine , physics , ultrasound , medicine , radiology , biology , acoustics , composite material , microbiology and biotechnology
Magnetic resonance elastography (MRE) is a non‐invasive imaging technique used to visualise and quantify mechanical properties of tissue, providing information beyond what can be currently achieved with standard MR sequences and could, for instance, provide new insight into pathological processes in the brain. This study uses the MRE technique at 3 T to extract the complex shear modulus for in vivo brain tissue utilizing a full three‐dimensional approach to reconstruction, removing contributions of the dilatational wave by application of the curl operator. A calibrated phantom is used to benchmark the MRE measurements, and in vivo results are presented for healthy volunteers. The results provide data for in vivo brain storage modulus ( G ′), finding grey matter (3.1 kPa) to be significantly stiffer than white matter (2.7 kPa). The first in vivo loss modulus ( G ″) measurements show no significant difference between grey matter (2.5 kPa) and white matter (2.5 kPa). Copyright © 2008 John Wiley & Sons, Ltd.