Response characterization of the precision open-ended coaxial probe for dielectric spectroscopy of breast tissue
ABSTRACT Large-scale dielectric spectroscopy of healthy and diseased breast tissue in the 0.1 to 20 GHz frequency range is currently underway. Open-ended coaxial probes are used as sensors to record the reflection coefficient of the tissue samples. The measured reflection coefficient is converted to the dielectric properties data through a suitable inverse technique. The collected data will aid in further advances of the microwave technology for early breast cancer detection. Thus, it is crucial to ensure the highest possible accuracy and reliability of the tissue measurements.
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ABSTRACT: To aid in the development of a long-range subcutaneous radio frequency identification tag to monitor the fate of sea lion pups, the dielectric properties of the cranial skin of young female otariids, and possible test subjects of similar size and age, or pigs (Sus scrofa) and sheep (Ovis aries) were obtained over a frequency range of 0.1-10 GHz at the base of their heads where the tag will be implanted. The resulting curves were similar in shape to adult human skin data, but the values were generally lower. Between subjects, variations were noted in all the species. Circuitry for the RF-ID tag is being designed to account for antenna detuning as a result of the lossy media or skin and the variation in dielectric properties.Physiological Measurement 11/2005; 26(5):627-37. · 1.62 Impact Factor
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ABSTRACT: The broadband dielectric properties of tumorous and non-tumorous tissues were analyzed at the microwave, millimeter wave, and terahertz ranges. In-vitro measurements were obtained using the coaxial probe and dispersive Fourier transform spectroscopy. Both techniques were modified to yield the complex real and imaginary permittivity, absorption coefficient, and refractive index. The results reveal the characteristic signatures of breast tissues and display a significant difference in the electromagnetic response of tumorous and non-tumorous tissues.Microwave Symposium, 2007. IEEE/MTT-S International; 07/2007
Conference Paper: Millimeter wave dielectric spectroscopy and breast cancer imaging[Show abstract] [Hide abstract]
ABSTRACT: In this paper, millimeter wave free-space quasi-optical spectroscopy technique is applied to determine the transmittance, complex refractive index and complex dielectric permittivity over 30 GHz to 120 GHz range. The imaging procedure is based on using these data for a solvable inverse imaging reconstructing problem. An image reconstruction is achieved to give the high resolution reconstructed images of the sample over a wide frequency range.Microwave Integrated Circuits Conference (EuMIC), 2012 7th European; 01/2012