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Kihyun Kwon,Sungkyu Lim,Sungjoon Cho,Jeonghoon Yoon,Jeiwon Cho,Changyul Cheon,Youngwoo Kwon IEEE 2006 IEEE microwave and wireless components letters Vol.16 No.1
<P>A three-way planar-type probe optimized for in-vivo permittivity measurements of biological materials has been developed. The probe in this letter consists of three orthogonally-faced probing apertures, which allows one to make accurate and uninterrupted measurements in three different directions per each insertion. As a result, this probe is significantly less invasive for the collection of the desired information of the biological materials, thus providing a vastly improved solution for in-vivo measurements. This probe can also be used for microwave ablation, in which case the treating region can be significantly expanded</P>
In-vivo measurements of the dielectric properties of breast carcinoma xenografted on nude mice
Cho, Jeiwon,Yoon, Jeonghoon,Cho, Sungjoon,Kwon, Kihyun,Lim, Sungkyu,Kim, Daeduk,Lee, Eun Sook,Kim, Chul Hwan,Choi, Jin Wook,Cheon, Changyul,Kwon, Youngwoo Alan R. Liss, Inc 2006 International journal of cancer Vol.119 No.3
<P>A developing method of cancer detection is to use electromagnetic waves to compare the dielectric properties of normal and cancerous tissue. Because most of the previous studies consisted of dielectric measurements taken ex-vivo, this study investigated the advantages of in-vivo measurements, obtained using the newly developed insertion-type planar probe, through the measurements of cancer (MDA MB 231), which was cultivated and implanted into the mammary fat pad of nude mice. Reflection coefficients were obtained in the broadband frequency range from 0.5 to 30 GHz, from which broadband complex permittivity data was extracted. Complex permittivity, in addition to other parameters such as conductivity and characteristic frequency, were used to make comparisons between cancerous tissue, normal muscle tissue and fat tissue, as well as comparisons between in-vivo and ex-vivo measurements. This study investigated the suitability of in-vivo cancer detection using microwaves with the newly developed insertion-type planar probe. Results showed that both sensitivity and specificity of the current method was 97%. In addition, predictive values were 99% for the positive and 94% for the negative, thus greatly enhancing the practicality of this method. In conclusion, it was demonstrated that in-vivo measurements are highly beneficial in studying the potential of microwaves as a diagnostic tool of breast cancer, especially in combination with the newly developed insertion-type planar probe. © 2006 Wiley-Liss, Inc.</P>