On the Frequency Dependence of Attenuation in Normal and Fatty Liver
作者： P.A. Narayana , J. Ophir
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摘要: Abstruct-The frequency dependence of the attenuation has been investigated in normal and fatty liver samples vitro. It was observed that exhibited essentially a linear dependent attenuation, while livers power law dependence, where exponent n between 1.25-1.4. In order to explain this nonlinear behavior, modeled as consisting tissue which is infiltrated by large number tiny fat globules are 4-10 size occasionally coalesce 100 p, thus act Rayleigh scatterers diagnostic wavelength range. The addition these consistent with clinical observation increased echogenicity livers. Based on physical description, absorption term, fourthader scattering term. This model predicts quantity (n - l) proportional fractional contribution total attenuation. For due scatter amounts 8-13 percent, compared 21 percent for
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