Complex dielectric measurements and analysis of brain tissues in the radio and microwave frequencies
Complex dielectric measurements and analysis of brain tissues in the radio and microwave frequencies
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DOI：
10.1109/22.641720
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发表时间：
1997-10-01
影响因子：
4.3
通讯作者：
Hurt, WD
中科院分区：
文献类型：
--
作者：
Bao, JZ;Lu, ST;Hurt, WD
我们用开放式同轴探头技术和HP8510B网络分析仪，在体温和室温下，对45 MHz到26.5 GHz频率范围内的大鼠大脑灰质和白质进行了体外复合介电测量。测量数据表现出两个分离的色散，并利用复杂的非线性最小二乘技术进行分析。我们提出了两个经验模型来描述实验数据：一个包含两个Cole-Cole函数的模型被用来描述本文的数据，另一个包含一个Havriliak-Negami函数和一个Cole-Cole函数的模型被用来结合过去和现在的文献数据，在100 kHz到26.5 GHz的更宽的频率范围内。在45兆赫以下的频率采用以前公布的数据，增加了模型的有效频率范围。
We present in-vitro complex dielectric measurements of gray and white matter of rat brains in the frequency range between 45 MHz and 26.5 GHz at body and room temperatures using the open-ended coaxial probe technique with an HP8510B network analyzer. The measurement data exhibited two separated dispersions, and were analyzed by means of a complex nonlinear least-squares technique. We suggest two empirical models to describe the experimental data: one containing two Cole-Cole functions was applied to the data from this paper, and another including one Havriliak-Negami and one Cole-Cole function was utilized to a combination of past and present literature data in a wider frequency range from 100 kHz to 26.5 GHz. The adoption of previously published data at the frequencies below 45 MHz increases the valid frequency range of the model.