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首页> 外文期刊>Mathematical Problems in Engineering >Analytical Model Based on a Cylindrical Geometry to Study RF Ablation with Needle-Like Internally Cooled Electrode
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Analytical Model Based on a Cylindrical Geometry to Study RF Ablation with Needle-Like Internally Cooled Electrode

机译：基于圆柱几何形状的分析模型，用于研究类似针的内部冷却电极的射频消融

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Radiofrequency (RF) ablation with internally cooled needle-like electrodes is widely used in medical techniques such as tumor ablation. The device consists of a metallic electrode with an internal liquid cooling system that cools the electrode surface. Theoretical modeling is a rapid and inexpensive way of studying different aspects of the RF ablation process by the bioheat equation, and the analytical approach provides an exact solution to the thermal problem. Our aim was to solve analytically the RF ablation transient time problem with a needle-like internally cooled cylindrical electrode while considering the blood perfusion term. The results showed that the maximal tissue temperature is reached ≈3mm from the electrode, which confirms previous experimental findings. We also observed that the temperature distributions were similar for three coolant temperature values (5℃, 15℃, and 25℃). The differences were only notable in temperature very close to the probe. Finally, considering the 50℃ line as a thermal lesion mark, we found that lesion diameter was around 2 cm, which is exactly that observed experimentally in perfused hepatic tissue and slightly smaller than that observed in nonperfused (ex vivo) hepatic tissue.
机译：具有内部冷却的针状电极的射频（RF）消融被广泛用于诸如肿瘤消融的医学技术中。该设备由一个带有内部液体冷却系统的金属电极组成，该系统可以冷却电极表面。理论建模是一种通过生物热方程研究射频消融过程各个方面的快速而廉价的方法，而分析方法则为热问题提供了精确的解决方案。我们的目标是在考虑血液灌注项的情况下，通过针状内部冷却的圆柱状电极分析解决射频消融瞬态时间问题。结果表明，距电极最高组织温度达到≈3mm，这证实了先前的实验结果。我们还观察到三个冷却剂温度值（5℃，15℃和25℃）的温度分布相似。仅在非常接近探针的温度下才注意到差异。最后，将50℃线作为热损伤标记，我们发现损伤直径约为2 cm，这与在灌注肝组织中实验观察到的直径完全相同，并且比在非灌注（离体）肝组织中观察到的直径稍小。

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  • 来源
    《Mathematical Problems in Engineering》 |2012年第2期|p.161-176|共16页
  • 作者

    Juan A. Lopez Molina; Maria J. Rivera; Enrique Berjano;

  • 作者单位

    Departamento de Matematica Aplicada, Instituto Universitario de MatemAtica Pura y Aplicada,Uniuersitat Politecnica de Valencia, 46022 Valencia, Spain;

    Departamento de Matematica Aplicada, Instituto Universitario de MatemAtica Pura y Aplicada,Uniuersitat Politecnica de Valencia, 46022 Valencia, Spain;

    Biomedical Synergy, Electronic Engineering Department, Universitat Politecnica de Valencia,46022 Valencia, Spain;

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