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Abstract #5593

Poroelastic and Viscoelastic MRE of Experimental Phantoms Actuated at 1Hz

Matthew McGarry1, Ligin Solamen1, Scott Gordon-Wylie1, John Weaver1,2, and Keith Paulsen1,2

1Thayer School of Engineering, Dartmouth College, Hanover, NH, United States, 2Dartmouth Hitchcock Medical Center, Lebanon, NH, United States

Poroelastic and viscoelastic inversions in a 1Hz experimental MR Elastography phantom system were investigated theoretically, numerically, and experimentally. At low frequencies, viscoelastic models have a non-uniqueness issue that can be avoided by using a poroelastic model, which has an additional fluid force term to balance elastic forces when inertial forces are negligible. Numerical experiments showed poroelastic models have much higher sensitivity to global property changes compared to viscoelastic models. Inversions of experimental phantom data with a poroelastic model gave cleaner images that are less sensitive to initial property estimates compared to a viscoelastic model.

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