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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Improving Patient Safety by Quantifying Vascular Tissue Damage from Radio Frequency Induced Heating of Implanted Medical Devices during Magnetic Resonance Imaging
TL;DR: This chapter discusses the background and Significance of the work, as well as some of the figures, which have been described in detail in the preface.
Journal ArticleDOI
Experimental study on thermal field in the vicinity of arterial bifurcation in microwave ablation therapy
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A study of heat distribution in human skin: use of Infrared Thermography
TL;DR: In this article, a two-dimensional multi-layer model using the Pennes equation to model biological properties and the equation of heat in a fluid, to model blood circulation in the veins was presented to understand the thermomechanical behavior of the skin and its direct environment when exposed to strong thermal variations.
Proceedings ArticleDOI
Free boundary model for local thermal coagulation: growth of a spherical and cylindrical necrosis domain
TL;DR: In this paper, a free boundary model is proposed to analyze the characteristic properties of local thermal coagulation depending on the applicator form, and it is shown that for the 3D case the necrosis growth exhibits saturation when thermal co-agulation is limited by heat diffusion.