Examination of the sensing radius of open-ended coaxial probes in dielectric measurements of biological tissues
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Date
2017-07-09Author
La Gioia, Alessandra
Porter, Emily
O'Halloran, Martin
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La Gioia, Alessandra, Porter, Emily, & O'Halloran, Martin. (2017). Examination of the sensing radius of open-ended coaxial probes in dielectric measurements of biological tissues. Paper presented at the 2017 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, San Diego, California, USA, 09-14 July, doi:10.1109/APUSNCURSINRSM.2017.8072150
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Abstract
A number of emerging electromagnetic diagnostic
and therapeutic devices are designed based on estimates of
benign and malignant tissue dielectric properties at different
frequencies and temperatures. Accurate tissue dielectric
measurements are crucial for the development of these
technologies. Although the dielectric measurement procedure is
straightforward, several factors can introduce uncertainties and
errors into dielectric data. These errors or confounders can be
strictly related to the acquisition system or to the intrinsic
properties of the investigated tissues. Generally, uncertainties are
higher in the dielectric measurement of diseased tissues, due to
their heterogeneity and complex structure and composition.
These confounders can be minimized by clearly defining the
measurement sensing volume, and characterizing the tissue
distribution within that volume. The volume is defined by sensing
depth and radius. In this work, early-stage experiments are
presented to investigate the sensing radius for biological
heterogeneous tissues, with the aim of providing more accurate
dielectric measurements to support medical device development.