Abstract
Tomographic imaging of the electrical properties distribution within biological subjects such as the human body has been an active research goal in electrical tomography (ET). As the electrical properties of a living tissue vary with the excitation frequency, measuring the frequency-dependent behaviour of the effective dielectric can increase the possibilities for tissue characterisation, and thus enhance the potential for extended clinical applications. The ET system generally enables to capture the changes in effective dielectric properties at low spatial resolution, therefore, the complete complex admittance spectrum can be reconstructed by ET to enrich the information content and further provide better diagnostic. In this work, we demonstrate a novel contactless ET system which relies on the capacitive coupled principle, the capacitive coupled electrical tomography (CCET). Except the non-contact measuring characteristic, the capacitance-based imaging principle enables the system to obtain the measurements at higher excitation frequencies. These characteristics give CCET great potential in future medical application, as the high-frequency component of complex impedance plays a dominant role in establishing the link between the microscopic cell structures and the macroscopic admittivity images obtained from multi-frequency ET systems. In this paper, we used multi-frequency electrical signals from 320 kHz to 14 MHz to conduct the single and multiple inclusions test with different biological samples. Both the reconstructed tomographic images and the Cole-Cole plots confirm the ability of CCET in characterising different objects.
Original language | English |
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Article number | 9410284 |
Pages (from-to) | 15277-15290 |
Number of pages | 14 |
Journal | IEEE Sensors Journal |
Volume | 21 |
Issue number | 13 |
Early online date | 21 Apr 2021 |
DOIs | |
Publication status | Published - 1 Jul 2021 |
Bibliographical note
Funding Information:Manuscript received February 10, 2021; revised April 10, 2021 and April 14, 2021; accepted April 18, 2021. Date of publication April 21, 2021; date of current version June 30, 2021. This work was supported in part by the University of Bath and in part by Raoul and Catherine Hughes through University Bath’s Alumni Office. The associate editor coordinating the review of this article and approving it for publication was Dr. Qammer H. Abbasi. (Corresponding author: Manuchehr Soleimani.) The authors are with the Electrical and Electronic Engineering Department, University of Bath, Bath BA2 7AY, U.K. (e-mail: [email protected]; [email protected]). Digital Object Identifier 10.1109/JSEN.2021.3074659
Publisher Copyright:
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Keywords
- Cole-Cole plots
- capacitive coupled electrical tomography (CCET)
- regional admittivity imaging
- spectroscopy tomography
- tissue characterisation
ASJC Scopus subject areas
- Instrumentation
- Electrical and Electronic Engineering