A Novel Fractal Model to Explain the Rheology of Liver Tissue using MR-Elastography
نویسندگان
چکیده
Introduction MR-Elastography (MRE) enables additional characterization of pathologies by providing new physical parameters, for instance the complex shear modulus G*(ω)=Gd(ω)+Gl(ω) at a single frequency [1,2]. However, interpretation of G*(ω) in terms of elastic and viscose properties necessitates the knowledge about the underlying rheological model. Tissue is a material with a hierarchical organization [3] and does not follow for instance the classical Voigt model [4], which is often used to interpret the observed frequency dependence of the measured shear wave speed [5]. Meaningful diagnostic interpretation of G*(ω) thus requires studying the underlying rheological model of normal and of pathological tissue in particular. Therefore, as a first step, a study of the frequency behavior of G*(ω) of fresh bovine liver tissue is conducted.
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