Studies on thin film based flexible gold electrode arrays for resistivity imaging in electrical impedance tomography

Bera, Tushar Kanti and Nagaraju, J (2014) Studies on thin film based flexible gold electrode arrays for resistivity imaging in electrical impedance tomography. In: MEASUREMENT, 47 . pp. 264-286.

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Abstract

Practical phantoms are essential to assess the electrical impedance tomography (EIT) systems for their validation, calibration and comparison purposes. Metal surface electrodes are generally used in practical phantoms which reduce the SNR of the boundary data due to their design and development errors. Novel flexible and biocompatible gold electrode arrays of high geometric precision are proposed to improve the boundary data quality in EIT. The flexible gold electrode arrays are developed on flexible FR4 sheets using thin film technology and practical gold electrode phantoms are developed with different configurations. Injecting a constant current to the phantom boundary the surface potentials are measured by a LabVIEW based data acquisition system and the resistivity images are reconstructed in EIDORS. Boundary data profile and the resistivity images obtained from the gold electrode phantoms are compared with identical phantoms developed with stainless steel electrodes. Surface profilometry, microscopy and the impedance spectroscopy show that the gold electrode arrays are smooth, geometrically precised and less resistive. Results show that the boundary data accuracy and image quality are improved with gold electrode arrays. Results show that the diametric resistivity plot (DRP), contrast to noise ratio (CNR), percentage of contrast recovery (PCR) and coefficient of contrast (COC) of reconstructed images are improved in gold electrode phantoms. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	MEASUREMENT
Publisher:	ELSEVIER SCI LTD
Additional Information:	copyright for this article belongs to ELSEVIER SCI LTD,ENGLAND
Keywords:	Electrical impedance tomography; Thin film; Flexible gold electrode array; Biocompatible Gold electrode phantom; Electrode surface profile; Electrical impedance spectroscopy; Resistivity images; EIDORS
Department/Centre:	Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited:	06 Jan 2014 10:15
Last Modified:	06 Jan 2014 10:25
URI:	http://eprints.iisc.ac.in/id/eprint/48133

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