Journal ArticleDOI
A New Simplified Bioheat Equation for the Effect of Blood Flow on Local Average Tissue Temperature
Sheldon Weinbaum,Latif M. Jiji +1 more
TLDR
A new simplified three-dimensional bioheat equation is derived to describe the effect of blood flow on blood-tissue heat transfer and shows that the vascularization of tissue causes it to behave as an anisotropic heat transfer medium.Abstract:
A new simplified three-dimensional bioheat equation is derived to describe the effect of blood flow on blood-tissue heat transfer. In two recent theoretical and experimental studies [1, 2] the authors have demonstrated that the so-called isotropic blood perfusion term in the existing bioheat equation is negligible because of the microvascular organization, and that the primary mechanism for blood-tissue energy exchange is incomplete countercurrent exchange in the thermally significant microvessels. The new theory to describe this basic mechanism shows that the vascularization of tissue causes it to behave as an anisotropic heat transfer medium. A remarkably simple expression is derived for the tensor conductivity of the tissue as a function of the local vascular geometry and flow velocity in the thermally significant countercurrent vessels. It is also shown that directed as opposed to isotropic blood perfusion between the countercurrent vessels can have a significant influence on heat transfer in regions where the countercurrent vessels are under 70-micron diameter. The new bioheat equation also describes this mechanism.read more
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Book ChapterDOI
Future Developments in Respect of Thermal Modeling, Treatment Planning, and Treatment Control for Interstitial Hyperthermia
TL;DR: The development of accurate 3-D hyperthermia treatment planning systems is still hindered by the complexity of tissue blood flow and the lack of information on normal and pathological vessel network properties of individual patients.
Journal ArticleDOI
Calculation of Effective Thermal Conductivity for Human Skin Using the Fractal Monte Carlo Method
Guillermo Rojas-Altamirano,René O. Vargas,Juan P. Escandón,R. Mil-Martínez,Alan Rojas-Montero +4 more
TL;DR: In this article , an effective thermal conductivity (ETC) for living tissues, which directly affects the energy transport process, is determined using fractal scaling and Monte Carlo methods.
Patent
Electrical conductivity probes and methods of making the same
TL;DR: In this article, a system for sensing attributes of tissue in at least one direction is provided, which includes a thermal conductivity probe having a sensor configured to measure thermal conductivities in the target tissue in one direction, and a power supply operatively coupled to the probe and being configured to supply power to the thermal probe.
Posted Content
Anomalous properties of heat diffusion in living tissue caused by branching artery network. Qualitative description
TL;DR: It is shown that under local strong heating of a small tissue domain the temperature distribution inside the surrounding tissue is affected substantially by heat superdiffusion.
Posted Content
Laser Induced Heat Diffusion Limited Tissue Coagulation: Problem and General Properties
TL;DR: The size of the resulting necrosis domain is determined by the physical characteristics of the tissue and its response to local heating, and by the applicator form rather than the treatment duration and the irradiation power.