Journal
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
Volume 8, Issue 2, Pages 155-160Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2018.2789357
Keywords
Coronary arteries; D-band; human tissue; material characterization; millimeter-wave (mm-wave) biosensing; Nicholson-Ross-Weir (NRW) conversion process; waveguide tissue capsule
Funding
- Beilinson Scientific Ethics Committee [0771-16-RMC]
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This paper presents, for the first time, measured complex dielectric and magnetic properties of liquid and solid biological tissues taken from human arteries in the frequency range 110-170 GHz. The complex permittivity and permeability are extracted from scattering parameters of a waveguide capsule loaded with biological tissue. The estimation of the dielectric properties was done by the Nicholson-Ross-Weir conversion process. A D-band waveguide setup for measuring with temperature stabilization at 37 degrees C was developed and is described herein. Results show large differences between dielectric properties of blood (10.7 + j2.9), adipose tissue (2.5 + j0.3), calcified tissue (3.2 + j0.84), and fibrous tissue (8.8+ j3.3). While calcified tissues and adipose tissues show relative permeability higher than 1 (1.8 - 1.4 + j0.2), fibrous tissues show mu(r) of 1 + j0.4 and blood proves to be diamagnetic with 0.7 + j0.5. The measured blood refractive index follows the frequency trend of the Cole-Cole model extrapolated data of previously measured blood at lower frequencies.
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