Estimation of overall heat transfer coefficient of cooling system in RF capacitive hyperthermia
The 
study presented in this article involves the estimation of the overall heat 
transfer coefficient of cooling system in RF capacitive hyperthermia 
treatment using inverse problem based on the conjugate gradient method to 
provide improved distribution of temperature. The temperature data computed 
numerically from the direct problem using the finite difference time domain 
method are used to simulate the temperature measurements. The effects of the 
errors and sensor positions upon the precision of the estimated results are 
also considered. The results show that a reasonable estimation of the unknown 
can be obtained. Finally, measurements in a tissue-equivalent phantom are 
employed to appraise the reliability of the presented method. The comparison of 
computed data with measurements shows a good agreement between numerical 
and experimental results.
STUDY OF WATER BOLUS EFFECT ON SAR PENETRATION DEPTH AND EFFECTIVE FIELD SIZE FOR LOCAL HYPERTHERMIA
Water bolus is used in microwave hyperthermia of cancer treatment to control the body surface temperature. In this paper the effect of water bolus on SAR distribution is investigated in the muscle layer of a three layered tissue model. Both the SAR penetration depth and the effective field size (EFS) are computed and compared in presence and in absence of the water bolus. Results are provided for distilled and fresh water with three different thicknesses of water bolus. All numerical simulations are performed using the Ansoft HFSS software. Numerical simulation results are in good agreement with published results.
Thermal conductivity and diathermancy of human skin for sources of intense thermal radiation employed in flash burn studies.
Some of the thermal and optical properties of skin have been determined for sources and exposure conditions involved in the study of the effects of intense radiation on uncovered and subfabric skin. The surface temperatures of irradiated painted and unpainted skin were measured with fine-wire thermocouples for exposure times ranging from 0.1 to 20 seconds, at radiation levels lower than those which would cause pain in the subject. The value of the important thermal parameter, the k ρ c product ( k , thermal conductivity; , density; c , specific heat), as determined from the measured surface temperatures of blackened skin was found to be 8.6 x 10−4 centimeter-gram-second units. The surface temperatures of skin when exposed to carbon-arc, to 3000°K tungsten, and to infrared radiation are approximately one-half those of blackened skin, and 30% less than those computed from opaque-solid theory. Good agreement between heat-flow theory and experiment on human skin is obtained if it is assumed that the skin is a homogeneous diathermous solid with a diathermancy which varies with wavelength.

Submitted on January 18, 1957