Mechanism of Acoustic Absorption in Tissue

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Abstract
A viscous mechanism for the absorption of ultrasonic energy in tissue is considered. Viscous forces acting between a suitably chosen distr. of suspended particles or structure elements and a suspending liquid can account for the exptly. observed linear relations between acoustic absorption coefficient and ultrasonic frequency. The frequency band Over which linearity obtains is detd. by the limits of the distr. of values for the parameters which describe the structure elements. Below the linear range the relation becomes quadratic, in agreement with expt., and at "high" frequencies a limiting value is approached asymptotically.

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