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Scattering of Ultrasound by Blood

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3 Author(s)
Shung, Koping K. ; Institute of Applied Physiology and Medicine, Providence Hospital, Seattle, WA 98122. ; Sigelmann, R.A. ; Reid, J.M.

The ultrasonic volumetric scattering cross section of the erythrocyte has been measured over a range of frequencies by comparing the rms value of the gated backscattered signal from the blood with that of a wave reflected from a flat reflector with known reflection coefficient. It is found to be proportional to the fourth power of the frequency predicted by the wave scattering theory for small particles in the frequency range from 5 MHz to 15 MHz. The relation between the scattering coefficient and the hematocrit is also examined up to a hematocrit of 45 percent. This coefficient is found to increase along with the hematocrit until it reaches a maximum around hematocrit = 26 percent and then decreases as the hematocrit increases. Twersky's wave scattering theory is applied to describe this result.

Published in:

Biomedical Engineering, IEEE Transactions on  (Volume:BME-23 ,  Issue: 6 )

Date of Publication:

Nov. 1976

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