Evans Audrey L, Ma Chu, Hagness Susan C
Annu Int Conf IEEE Eng Med Biol Soc. 2020 Jul;2020:5267-5271. doi: 10.1109/EMBC44109.2020.9175822.
Microwave-induced thermoacoustic (TA) imaging is a potential alternative to conventional real-time imaging methods for monitoring microwave ablation (MWA). In this study, we develop a multi-physics model for the generation and propagation of microwave-induced TA signals during pulsed MWA. Our model couples electromagnetics, heat transfer, and acoustics physics. We compare simulation and experimental results for a pulsed MWA system wherein a coaxial MWA antenna is used to heat water. The simulated and experimentally measured TA signals for this configuration are in good qualitative agreement. This multi-physics modeling tool is valuable for understanding the fundamentals of TA signal generation and propagation from within an evolving ablation zone.
微波诱导热声（TA）成像对于监测微波消融（MWA）而言，是一种有潜力替代传统实时成像方法的技术。在本研究中，我们针对脉冲式MWA期间微波诱导TA信号的产生与传播，开发了一个多物理场模型。我们的模型耦合了电磁学、热传导和声学物理。我们对一个使用同轴MWA天线加热水的脉冲MWA系统的模拟结果与实验结果进行了比较。此配置下模拟和实验测量得到的TA信号在定性上吻合良好。这种多物理场建模工具对于理解TA信号在不断演变的消融区内产生和传播的基本原理很有价值。
