In-Vivo Time Domain Measurement of Dielectric Properties of Human Body Tissue

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  • 人体組織に対する電気定数のｉｎ－ｖｉｖｏ時間領域測定
  • ジンタイ ソシキ ニ タイスル デンキ テイスウ ノ in vivo ジカン リョウイキ ソクテイ

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It is essential to measure dielectric properties of human tissues for the safety evaluation of electromagnetic field exposures. In this paper, towards developing an in-vivo measurement method for living human tissues, we employed an open-ended coaxial probe together with a time domain reflectometry (TDR) technique, which probably enables us to extract a reflected waveform from some specified tissues in the time domain. We compared the TDR-measured dielectric properties for human surface tissues with those derived from a conventional frequency-domain technique. As a result, we found a fair agreement between them in the frequency range from 300 MHz to 6 GHz. This result suggests the possibility of in-vivo dielectric property measurement for superficial human tissues by using the proposed TDR technique.

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