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Abstract #1014

Viscoelastic MRE Phantoms with Tunable Damping Ratio Independent of Shear Stiffness

L. Tyler Williams1, Zheng Cao1, Matthew D. J. McGarry2, Elise A. Corbin1, and Curtis L. Johnson1
1Biomedical Engineering, University of Delaware, Newark, DE, United States, 2Thayer School of Engineering, Dartmouth College, Hanover, NH, United States

This study validates the use of LPAA/PAA gels as viscoelastic MRE phantoms with tunable damping ratio independent of shear stiffness. PAA concentration was 6wt% across all phantoms while LPAA concentration ranged from 0 to 6wt%. High-resolution MRE scans were conducted with 600, 700, 800, and 900 Hz vibrations. For each frequency, storage modulus and shear stiffness were constant while loss modulus and damping ratio increased with increasing LPAA concentration. For each LPAA concentration, loss modulus increased with increasing frequency indicating viscoelastic behavior. These results verify the independent tunability of damping ratio and shear stiffness.

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