Magnetic Resonance Elastography (MRE) data show high-amplitude, low frequency artifact which does not accord with the viscoelastic model in near-incompressible tissue. This exploratory study investigates whether the low frequency behavior is poroelastic, and if so whether slow compression wavelengths can be estimated. A cohort of abdominal MRE acquisitions at four frequencies were convolved with a fine-grained Gabor filter bank, and the frequency response of the acquisitions were pooled across subjects for liver and spleen regions. The pooled frequency responses for both liver and spleen showed a shifting peak in the response function mass that tracked with the increase in frequency, with wavespeeds in the shear regime. A second peak identified a lower frequency regime. This regime produced values similar to those observed in tissue poroelastic behaviors.
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