Reflection-Geometry Measurements of Biological Materials Using Photonically Generated Millimeter Waves

Hiroshi YAMAMOTO  Hiroshi ITO  

IEICE TRANSACTIONS on Electronics   Vol.E96-C   No.2   pp.235-240
Publication Date: 2013/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E96.C.235
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Photonics Technology)
millimeter wave,  UTC-PD,  hydration rate,  biological tissue,  

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This paper describes two promising millimeter-wave measurement techniques suitable for biological materials. One is reflection-geometry imaging using a low-coherence signal, and the other is millimeter-wave ellipsometry. Imaging porcine tissue during the desiccation process, we found the temporal variation of the reflection intensity to be well explained by an exponential decrease of the relative dielectric constant. Ellipsometry results showed that the complex relative dielectric constant also decreased exponentially with time during the desiccation process and that for bovine tissue the gradients for the real and imaginary parts of the constant were different. The implications of these results on the distribution of water in biological tissues are discussed.