Absorption of Sound Arising from the Presence of Intact Cells in Blood

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Abstract
The absorption of sound in blood occurs primarily on a molecular level and is related to the presence of protein in the cells and plasma. However, a small contribution to the total absorption arises simply from the presence of intact cells. Analysis based on a theory of scattering shows that the cellular absorption results from a viscous interaction between the fluid and cells when the latter, because of their greater density, fall to follow the oscillatory motion set up by the sound wave.

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