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THEORETICAL ESTIMATION AND EXPERIMENTAL TECHNIQUES FOR THE DETERMINATION OF THE TEMPERATURE DEPENDENCE OF BACKSCATTERED ULTRASONIC POWER
 

Summary: THEORETICAL ESTIMATION AND EXPERIMENTAL TECHNIQUES FOR THE DETERMINATION OF THE
TEMPERATURE DEPENDENCE OF BACKSCATTERED ULTRASONIC POWER
William L. Straube and R. Martin Arthur*
Mallinckrodt Institute of Radiology and *Electronic Systems and Signals Research Laboratory
Washington University, St. Louis, MO
ABSTRACT
The backscattered signal received from an insonified volume of tissue was
modeled to determine the response of the backscattered signal to a change
in temperature. The temperature dependent parameters of the model were
velocity, attenuation and backscatter coefficient. Analysis of the model for a
lipid scatterer and an aqueous scatterer in a water-based medium showed
that the temperature dependence of backscattered power was dominated by
the effect of temperature on the backscatter coefficient. The temperature
dependence of attenuation had a small effect on backscattered power and
the backscattered power was independent of effects of temperature on
velocity. The temperature dependence of the backscatter coefficient was
inferred assuming that the backscatter coefficient was proportional to the
scattering cross-section of a small scatterer. Backscattered power
increased nearly logarithmically with temperature over the range from 37 to
50 oC. Our model predicted a change of +5 dB for the lipid scatterer and -3

  

Source: Arthur, R. Martin - Department of Electrical and Systems Engineering, Washington University in St. Louis

 

Collections: Biology and Medicine; Engineering