A Fundamental Numerical Analysis for Noninvasive Thermometry Integrated in a Heating Applicator Based on the Reentrant Cavity

H. Ohwada, Y. Ishihara
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引用次数: 1

Abstract

To improve the efficacy of hyperthermia treatment, a novel method of noninvasive measurement of body temperature change is proposed. The proposed technology, thermometry, is based on changes in the electromagnetic field distribution inside the heating applicator with temperature changes and the temperature dependence of the dielectric constant. In addition, an image of the temperature change distribution inside a body is reconstructed by applying a computed tomography (CT) algorithm. The proposed thermometry method can serve as a possible noninvasive method to monitor the temperature change distribution inside the body without the use of enormous thermometers such as in the case of magnetic resonance imaging (MRI). Furthermore, this temperature monitoring method can be easily combined with a heating applicator based on a cavity resonator, and the novel integrated treatment system can possibly be used to treat cancer effectively while noninvasively monitoring the heating effect. In this paper, the phase change distributions of the electromagnetic field with temperature changes are simulated by numerical analysis using the finite difference time domain (FDTD) method. Moreover, to estimate the phase change distributions inside a target body, the phase change distributions with temperature changes are reconstructed by a filtered back-projection. In addition, the reconstruction accuracy of the converted temperature change distribution from the phase change is evaluated
基于可重入腔的加热器无创测温的基本数值分析
为了提高热疗治疗的疗效,提出了一种无创测量体温变化的新方法。所提出的测温技术是基于加热装置内部电磁场分布随温度变化的变化以及介电常数对温度的依赖关系。此外,利用计算机断层扫描(CT)算法重建了人体内部温度变化分布的图像。所提出的测温方法可以作为一种可能的无创方法来监测体内的温度变化分布,而不需要像磁共振成像(MRI)那样使用巨大的温度计。此外,这种温度监测方法可以很容易地与基于腔谐振器的加热应用器相结合,并且新的集成治疗系统可以在无创监测加热效果的同时有效地治疗癌症。本文采用时域有限差分(FDTD)方法,对温度变化时电磁场的相变分布进行了数值模拟。此外,为了估计目标体内部的相变分布,通过滤波后的反投影重建了温度变化时的相变分布。此外,还对相变转换后的温度变化分布重建精度进行了评价
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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