A Self-Heated Thermistor Technique to Measure Effective Thermal Properties From the Tissue Surface

[+] Author and Article Information
P. A. Patel, J. W. Valvano, J. A. Pearce, S. A. Prahl, C. R. Denham

Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712

J Biomech Eng 109(4), 330-335 (Nov 01, 1987) (6 pages) doi:10.1115/1.3138689 History: Received August 04, 1986; Revised July 20, 1987; Online June 12, 2009


A microcomputer based instrument to measure effective thermal conductivity and diffusivity at the surface of a tissue has been developed. Self-heated spherical thermistors, partially embedded in an insulator, are used to simultaneously heat tissue and measure the resulting temperature rise. The temperature increase of the thermistor for a given applied power is a function of the combined thermal properties of the insulator, the thermistor, and the tissue. Once the probe is calibrated, the instrument accurately measures the thermal properties of tissue. Conductivity measurements are accurate to 2 percent and diffusivity measurements are accurate to 4 percent. A simplified bioheat equation is used which assumes the effective tissue thermal conductivity is a linear function of perfusion. Since tissue blood flow strongly affects heat transfer, the surface thermistor probe is quite sensitive to perfusion.

Copyright © 1987 by ASME
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