灰质介电特性随温度变化的研究

2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med) Pub Date : 2018-09-01 DOI:10.23919/EMF-MED.2018.8526004

J. Bonello, A. Athanasiadis, L. Farrugia, C. Sammut

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引用次数: 1

摘要

微波热疗与放疗和化疗结合使用，为治疗脑癌提供了一种更有效的方法。脑组织的介电特性对预测脑内的特定吸收率(SAR)模式具有重要意义。本研究调查了脑介电特性随频率和温度的变化，因为这些对于SAR计算和治疗计划至关重要。在室温至60℃范围内，测量了新鲜切除的猪脑组织在0.4 ~ 20 GHz频率范围内的介电特性。结果表明，各频率下的介电常数随温度的升高而减小，而电导率在1 GHz以下变化不明显，在1 GHz以上则减小。

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A study on the variation of dielectric properties of grey matter with temperature

Microwave hyperthermia is used in conjunction with radiotherapy and chemotherapy to provide a more effective way of treating cancer in the brain. The dielectric properties of brain tissue are important in predicting specific absorption rate (SAR) patterns in the brain. This study investigates the variation of brain dielectric properties as a function of frequency and temperature as these are crucial for SAR calculations, and hence treatment planning. We measured dielectric properties of freshly excised porcine brain tissues over the frequency range 0.4 to 20 GHz from room temperature to 60 °C. The results show that the permittivity decreases with temperature at all frequencies while the conductivity does not vary significantly below 1 GHz and decreases above this frequency.

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2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med)

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