Thermal-electrical finite element modelling for radio frequency cardiac ablation: Effects of changes in myocardial properties

S. Tungjitkusolmun, E. J. Woo, H. Cao, J. Z. Tsai, V. R. Vorperian, J. G. Webster

研究成果: 雜誌貢獻期刊論文同行評審

109 引文 斯高帕斯(Scopus)

摘要

Finite element (FE) analysis has been utilised as a numerical tool to determine the temperature distribution in studies of radio frequency (RF) cardiac ablation. However, none of the previous FE analyses clarified such computational aspects as software requirements, computation time or convergence test. In addition, myocardial properties included in the previous models vary greatly. A process of FE modelling of a system that included blood, myocardium, and an ablation catheter with a thermistor embedded at the tip is described. The bio-heat equation is solved to determine the temperature distribution in myocardium using a commercial software application (ABAQUS). A Cauchy convergence test (e =0.1°C) was performed and it is concluded that the optimal number of elements for the proposed system is 24610. The effects of changes in myocardial properties (±50% electric conductivity, + 100%/-50% thermal conductivity, and + 100%/-50% specific heat capacity) in both power-controlled (PCRFA) and temperature-controlled RF ablation (TCRFA) were studied. Changes in myocardial properties affect the results of the FE analyses of PCRFA more than those of TCRFA, and the maximum changes in lesion volumes were -58.6% (-50% electric conductivity), -60.7% (+ 100% thermal conductivity), and +43.2% (-50% specific heat).

原文???core.languages.en_GB???
頁(從 - 到)562-568
頁數7
期刊Medical and Biological Engineering and Computing
38
發行號5
DOIs
出版狀態已出版 - 2000

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