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dc.contributor.authorLa Gioia, Alessandra
dc.contributor.authorO'Halloran, Martin
dc.contributor.authorPorter, Emily
dc.identifier.citationLa Gioia, Alessandra, O'Halloran, Martin, & Porter, Emily. (2018). Modelling the Sensing Radius of a Coaxial Probe for Dielectric Characterisation of Biological Tissues. IEEE Access, 6, 46516-46526. doi:10.1109/ACCESS.2018.2866703en_IE
dc.description.abstractThe open-ended coaxial probe is the most common measurement tool used to dielectrically characterize biological tissues. Most healthy and malignant biological tissues are macroscopically heterogeneous, with the exception of a few tissues, such as liver. Heterogeneous biological samples are dielectrically characterized by defining the dielectric properties of each tissue type constituting the sample. In order to accurately characterize a specific tissue type with a coaxial probe, it is fundamental that only the tissue of interest is contained within the probe sensing volume, which is defined by the sensing radius and sensing depth. In the literature, several studies have investigated the sensing depth with bilayer or multilayer heterogeneous tissues. However, in this paper, we examine the sensing radius through concentrically heterogeneous tissues. In particular, samples composed of two different concentric tissues were modeled to estimate the minimum width of the homogenous tissue region required to accurately acquire the corresponding dielectric properties. As recent studies have indicated that the sensing radius depends on the dielectric properties of the interrogated tissue, in this paper, the sensing radius of a coaxial probe has been numerically quantified across a wide range of scenarios, involving different tissues with varying dielectric contrasts. The numerical results indicate that: 1) the sensing radius increases with the contrast in permittivity between the constituent tissues and 2) the sensing radius is highly dependent on the permittivity of the tissue closest to the inner conductor of the probe. Finally, the numerical outcome has been confirmed with dielectric measurements performed on animal tissues.en_IE
dc.description.sponsorshipThis work has been developed in the framework of COST Action MiMed (TD1301).en_IE
dc.publisherInstitute of Electrical and Electronics Engineersen_IE
dc.relation.ispartofIeee Accessen
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.subjectBiological tissuesen_IE
dc.subjectcoaxial probeen_IE
dc.subjectdielectric measurementen_IE
dc.subjectelectromagnetic simulationsen_IE
dc.subjectsensing radiusen_IE
dc.titleModelling the sensing radius of a coaxial probe for dielectric characterisation of biological tissuesen_IE
dc.local.contactMartin O'Halloran, School Of E&I/School Of Medicine, Nui Galway. 5072 Email:

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