Abstract #1007

Anisotropic stiffness of the supraspinatus muscle estimated via MR elastography and transversely isotropic nonlinear inversion.

Elijah Van Houten¹, Cyril Tous^2,3, Alexandre Jodoin⁴, Matthew McGarry⁵, Philip Bayly⁶, Keith Paulsen^5,7, Curtis Johnson⁸, and Nathalie Bureau^2,4

¹Mechanical Engineering, Université de Sherbroke, Sherbrooke, QC, Canada, ²Centre de recherche du Centre hospitalier de l’Université de Montréal, Montréal, QC, Canada, ³Université de Montréal, Montréal, QC, Canada, ⁴Department of Radiology, Centre hospitalier de l’Université de Montréal, Montréal, QC, Canada, ⁵Thayer School of Engineering, Dartmouth College, Hanover, NH, United States, ⁶Department of Mechanical Engineering & Materials Science, Washington University in St. Louis, St. Louis, MO, United States, ⁷Dartmouth-Hitchcock Medical Center, Lebanon, NH, United States, ⁸Department of Biomedical Engineering, University of Delaware, Newark, DE, United States

Surgical planning for rotator cuff repair would benefit significantly from quantitative measures of the muscle stiffness to avoid re-tearing of the muscle after surgery. MR Elastography (MRE) can provide quantitative measures of soft tissue stiffness in-vivo, but repeatable, stable results require accurate tissue models capable of treating the specific geometry and highly anisotropic structure of muscle tissue. Here, MRE based on a nearly incompressible, transversely isotropic continuum model is developed and applied to the case of the supraspinatus muscle. Overall, results show good agreement between reconstructed anisotropic stiffness values and independently published results based on wavelength analysis.

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