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Three-dimensional electrical impedance tomography

Nature volume 380, pages 509–512 (1996)Cite this article

Abstract

THE electrical resistivity of mammalian tissues varies widely1–5 and is correlated with physiological function6–8. Electrical impedance tomography (EIT) can be used to probe such variations in vivo, and offers a non-invasive means of imaging the internal conductivity distribution of the human body9–11. But the computational complexity of EIT has severe practical limitations, and previous work has been restricted to considering image reconstruction as an essentially two-dimensional problem10,12. This simplification can limit significantly the imaging capabilities of EIT, as the electric currents used to determine the conductivity variations will not in general be confined to a two-dimensional plane13. A few studies have attempted three-dimensional EIT image reconstruction14,15, but have not yet succeeded in generating images of a quality suitable for clinical applications. Here we report the development of a three-dimensional EIT system with greatly improved imaging capabilities, which combines our 64-electrode data-collection apparatus16 with customized matrix inversion techniques. Our results demonstrate the practical potential of EIT for clinical applications, such as lung or brain imaging and diagnostic screening8.

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Authors and Affiliations

  1. Department of Medical Physics and Clinical Engineering, University of Sheffield, Royal Hallamshire Hospital, Glossop Road, Sheffield, S10 2JF, UK

    P. Metherall, D. C. Barber, R. H. Smallwood & B. H. Brown

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  1. P. Metherall
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  2. D. C. Barber
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  3. R. H. Smallwood
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  4. B. H. Brown
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Metherall, P., Barber, D., Smallwood, R. et al. Three-dimensional electrical impedance tomography. Nature 380, 509–512 (1996). https://doi.org/10.1038/380509a0

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