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Common Ground Method of Current Injection in Electrical Impedance Tomography

Bera, Tushar Kanti and Nagaraju, J (2012) Common Ground Method of Current Injection in Electrical Impedance Tomography. In: 4th ObCom International Conference on Recent Trends in Computing, Communication and Information Technology, DEC 09-11, 2011 , Vellore, INDIA, pp. 574-587.

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Official URL: http://link.springer.com/chapter/10.1007/978-3-642...

Abstract

Surface electrodes are essentially required to be switched for boundary data collection in electrical impedance tomography (Ell). Parallel digital data bits are required to operate the multiplexers used, generally, for electrode switching in ELT. More the electrodes in an EIT system more the digital data bits are needed. For a sixteen electrode system. 16 parallel digital data bits are required to operate the multiplexers in opposite or neighbouring current injection method. In this paper a common ground current injection is proposed for EIT and the resistivity imaging is studied. Common ground method needs only two analog multiplexers each of which need only 4 digital data bits and hence only 8 digital bits are required to switch the 16 surface electrodes. Results show that the USB based data acquisition system sequentially generate digital data required for multiplexers operating in common ground current injection method. The profile of the boundary data collected from practical phantom show that the multiplexers are operating in the required sequence in common ground current injection protocol. The voltage peaks obtained for all the inhomogeneity configurations are found at the accurate positions in the boundary data matrix which proved the sequential operation of multiplexers. Resistivity images reconstructed from the boundary data collected from the practical phantom with different configurations also show that the entire digital data generation module is functioning properly. Reconstructed images and their image parameters proved that the boundary data are successfully acquired by the DAQ system which in turn indicates a sequential and proper operation of multiplexers.

Item Type: Conference Paper
Additional Information: Copyright for this article belongs to SPRINGER-VERLAG BERLIN, GERMANY
Keywords: electrical impedance tomography;common ground current injection;surface electrodes;practical phantom;inhomogeneity; image reconstruction;resistivity image; IDORS
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Depositing User: Francis Jayakanth
Date Deposited: 07 Feb 2013 11:47
Last Modified: 07 Feb 2013 11:47
URI: http://eprints.iisc.ac.in/id/eprint/45746

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