A SELF-HEATED THERMISTOR TECHNIQUE TO MEASURE EFFECTIVE THERMAL-PROPERTIES FROM THE TISSUE SURFACE
A SELF-HEATED THERMISTOR TECHNIQUE TO MEASURE EFFECTIVE THERMAL-PROPERTIES FROM THE TISSUE SURFACE
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DOI：
10.1115/1.3138689
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发表时间：
1987-11-01
影响因子：
1.7
通讯作者：
DENHAM, CR
中科院分区：
文献类型：
--
作者：
PATEL, PA;VALVANO, JW;DENHAM, CR
已经开发出一种基于微计算机的仪器，用于测量组织表面的有效导热率和扩散率。自加热球形热敏电阻部分嵌入绝缘体中，用于同时加热组织并测量由此产生的温升。对于给定的施加功率，热敏电阻的温度升高是绝缘体、热敏电阻和组织的组合热特性的函数。探头校准后，仪器即可准确测量组织的热特性。电导率测量精确至 2%，扩散率测量精确至 4%。使用简化的生物热方程，假设有效组织热导率是灌注的线性函数。由于组织血流强烈影响热传递，因此表面热敏电阻探头对灌注非常敏感。
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.