29 March 2013 Development of a poroelastic dynamic mechanical analysis technique for biphasic media
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Abstract
Magnetic resonance elastography is a technique where mechanical properties of materials are estimated by fitting a mechanical model to an MRI-acquired displacement field. These models have been primarily limited to viscoelasticity and linear elasticity, and only recently has poroelasticity been utilized as an applied model. To validate these estimates, the same material is measured via an independent dynamic mechanical analysis device. However, these devices only apply analytic viscoelastic models. In some cases, there is a model mismatch if a viscoelastic mechanical analysis is being compared to a poroelastic model in elastography. Thus, a poroelastic dynamic mechanical analysis technique is needed to properly measure porous media and compare the results with the appropriate elastography technique. A finite element technique was implemented on a TA-Q800 Dynamic Mechanical Analysis machine similar to the algorithm used in the corresponding MR elastography method. A viscoelastic version of the finite element code was created to validate the theory and show results similar to those obtained by the analytic DMA solution. Also, differences were seen that can be attributed to inertial forces not accounted for by an analytical solution. A poroelastic algorithm was then applied, showing great promise in the ability to measure properties of porous tissues.
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Adam J. Pattison, Adam J. Pattison, Matthew D. J. McGarry, Matthew D. J. McGarry, John B. Weaver, John B. Weaver, Keith D. Paulsen, Keith D. Paulsen, } "Development of a poroelastic dynamic mechanical analysis technique for biphasic media", Proc. SPIE 8672, Medical Imaging 2013: Biomedical Applications in Molecular, Structural, and Functional Imaging, 86721P (29 March 2013); doi: 10.1117/12.2008777; https://doi.org/10.1117/12.2008777
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