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Abstract #1007

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

Elijah Van Houten1, Cyril Tous2,3, Alexandre Jodoin4, Matthew McGarry5, Philip Bayly6, Keith Paulsen5,7, Curtis Johnson8, and Nathalie Bureau2,4
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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