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首页> 外文期刊>Journal of Biomechanics >Analysis and analytical characterization of bioheat transfer during radiofrequency ablation
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Analysis and analytical characterization of bioheat transfer during radiofrequency ablation

机译:射频消融过程中生物传热的分析和表征

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Understanding thermal transport and temperature distribution within biological organs is important for therapeutic aspects related to hyperthermia treatments such as radiofrequency ablation (RFA). Unlike surface heating, the RFA treatment volumetrically heats up the biological media using a heating probe which provides the input energy. In this situation, the shape of the affected region is annular, which is described by an axisymmetric geometry. To better understand the temperature responses of the living tissues subject to RFA, comprehensive characteristics of bioheat transport through the annular biological medium is presented under local thermal non-equilibrium (LTNE) condition. Following the operational features of the RFA treatment, based on the porous media theory, analytical solutions have been derived for the blood and tissue temperature distributions as well as an overall heat exchange correlation in cylindrical coordinates. Our analytical results have been validated against three limiting cases which exist in the literature. The effects of various physiological parameters, such as metabolic heat generation, volume fraction of the vascular space, ratio of the effective blood to tissue conductivities, different biological media and the rate of heat exchange between the lumen and the tissue are investigated. Solutions developed in this study are valuable for thermal therapy planning of RFA. A criterion is also established to link deep heating protocol to surface heating. (C) 2015 Elsevier Ltd. All rights reserved.
机译:了解生物器官内的热传递和温度分布对于与热疗相关的治疗方面非常重要,例如射频消融(RFA)。与表面加热不同,RFA处理使用提供输入能量的加热探针对生物介质进行体积加热。在这种情况下,受影响区域的形状是环形的,这由轴对称几何形状描述。为了更好地了解受RFA刺激的生物组织的温度响应,在局部热非平衡(LTNE)条件下,提供了通过环状生物介质进行生物热传递的综合特征。遵循RFA处理的操作特征,基于多孔介质理论,已经得出了血液和组织温度分布以及圆柱坐标中的整体热交换相关性的分析解决方案。我们的分析结果已经针对文献中存在的三个限制性案例进行了验证。研究了各种生理参数的影响,例如代谢热的产生,血管空间的体积分数,有效血液与组织电导率的比值,不同的生物介质以及管腔与组织之间的热交换率。这项研究中开发的解决方案对于RFA的热疗计划很有价值。还建立了将深度加热协议与表面加热联系起来的标准。 (C)2015 Elsevier Ltd.保留所有权利。

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