Journal ArticleDOI
Dielectric properties of female human breast tissue measured in vitro at 3.2 GHz
A M Campbell,D V Land +1 more
TLDR
It is concluded that the dielectric relaxation of tissue water is not the only dispersive process occurring at this frequency: dielectrics relaxation of bound water and the tail end of a beta-dispersion may also contribute to the dielection properties.Abstract:
Complex permittivities of in vitro diseased and undiseased human female breast tissues have been measured at 3.2 GHz using a resonant cavity technique. Ranges of dielectric properties and water contents of these tissues are presented. Experimental data are compared with models predicted from mixture equations. Measured permittivity data lie within limits set by two-phase mixture theory, but some conductivity data are in excess of those expected for a mixture of saline and protein. At any particular microwave frequency in all tissue of a given type, the relationship between permittivity and conductivity may be parametrized using the Debye relaxation equations. For each breast tissue type a characteristic relaxation frequency was calculated and found to be lower than that of physiological saline at the same temperature. It is concluded that the dielectric relaxation of tissue water is not the only dispersive process occurring at this frequency: dielectric relaxation of bound water and the tail end of a beta-dispersion may also contribute to the dielectric properties. The similarity of the dielectric properties of benign and malignant breast tumours measured in this work suggest that in vivo dielectric imaging methods will not be capable of distinguishing them.read more
Citations
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Journal ArticleDOI
A large-scale study of the ultrawideband microwave dielectric properties of normal, benign and malignant breast tissues obtained from cancer surgeries
Mariya Lazebnik,D. Popovic,L. McCartney,Cynthia B Watkins,Mary J. Lindstrom,Josephine Harter,Sarah Sewall,Travis Ogilvie,Anthony M. Magliocco,Tara M. Breslin,Walley J. Temple,Daphne Mew,John H. Booske,Michal Okoniewski,Susan C. Hagness +14 more
TL;DR: A large-scale study to experimentally determine the ultrawideband microwave dielectric properties of a variety of normal, malignant and benign breast tissues, measured from 0.5 to 20 GHz using a precision open-ended coaxial probe shows that the contrast in the microwave-frequency dielectrics properties betweenmalignant and normal adipose-dominated tissues in the breast is considerable, as large as 10:1.
Journal ArticleDOI
A large-scale study of the ultrawideband microwave dielectric properties of normal breast tissue obtained from reduction surgeries.
Mariya Lazebnik,L. McCartney,D. Popovic,Cynthia B Watkins,Mary J. Lindstrom,Josephine Harter,Sarah Sewall,Anthony M. Magliocco,John H. Booske,Michal Okoniewski,Susan C. Hagness +10 more
TL;DR: It is revealed that there is a large variation in the dielectric properties of normal breast tissue due to substantial tissue heterogeneity, and there is no statistically significant difference between the within-patient and between-patient variability in the Dielectric Properties.
Journal ArticleDOI
Enhancing breast tumor detection with near-field imaging
TL;DR: In this paper, the main focus is on active microwave systems, in particular microwave tomography and confocal microwave imaging, and the main features of active, passive, and hybrid systems under investigation for breast cancer detection.
Journal ArticleDOI
Microwave Imaging for Breast Cancer
TL;DR: An overview on medical imaging using microwave imaging for breast cancer and its challenges, hopes, and outlook is presented.
Journal ArticleDOI
Radar-Based Breast Cancer Detection Using a Hemispherical Antenna Array—Experimental Results
TL;DR: An ultrawideband (UWB) microwave system for breast cancer detection is presented, demonstrating the successful detection of 4 and 6 mm diameter spherical tumors in the curved breast phantom.
References
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Journal ArticleDOI
Dispersion and Absorption in Dielectrics I. Alternating Current Characteristics
Kenneth S. Cole,Robert H. Cole +1 more
TL;DR: In this paper, the locus of the dielectric constant in the complex plane was defined to be a circular arc with end points on the axis of reals and center below this axis.
Journal Article
Dielectric properties of tissues and biological materials: a critical review.
Foster Kr,H. P. Schwan +1 more
TL;DR: The classical principles behind dielectric relaxation are summarized, as empirical correlations with tissue water content in other compositional variables, and a comprehensive table is presented of dielectrics properties.
Journal ArticleDOI
Dielectric properties of breast carcinoma and the surrounding tissues
TL;DR: The results seem to indicate that RF impedance imaging can potentially be used as a diagnostic modality for the detection of human breast carcinoma by suggesting structural and cellular inhomogeneities of the tumor tissue.
Journal ArticleDOI
Dispersion and Absorption in Dielectrics II. Direct Current Characteristics
Kenneth S. Cole,Robert H. Cole +1 more
TL;DR: In this paper, it was shown that the complex dielectric constant, e*, of many liquid and solid dielectrics is given by a single very general formula e*=e∞+(e0−e ∞)/[1+(iωτ0)1−α] In this equation e0 and e∞ are the ''static'' and ''infinite frequency'' dielectoric constants, ω = 2π times the frequency, τ 0 is a generalized relaxation time and α is a constant, 0 < α < 1 The transient current as a