Shear rheometry was combined with magnetic resonance elastography (MRE) in a 1.5-T clinical system and a 0.5-T tabletop MRE system to investigate the viscoelastic powerlaw behavior of heparin and polyacrylamide (PAAm) over more than three orders of magnitude dynamic range. While heparin has softer properties than encountered in soft in-vivo tissues, crosslinked PAAm has similar stiffness as measured for in-vivo tissues, however, with lower dispersive properties. Overall both materials are good candidates for the use as standard phantom materials in MRE due to their well predictable springpot properties across the full frequency range relevant for MRE investigations.
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