PMID: 9183805May 1, 1997Paper

Extraction of electrical characteristics from pixels of multifrequency EIT images

Physiological Measurement
A J FitzgeraldL C Ward

Abstract

Computer modelling has shown that electrical characteristics of individual pixels may be extracted from within multiple-frequency electrical impedance tomography (MFEIT) images formed using a reference data set obtained from a purely resistive, homogeneous medium. In some applications it is desirable to extract the electrical characteristics of individual pixels from images where a purely resistive, homogeneous reference data set is not available. One such application of the technique of MFEIT is to allow the acquisition of in vivo images using reference data sets obtained from a non-homogeneous medium with a reactive component. However, the reactive component of the reference data set introduces difficulties with the extraction of the true electrical characteristics from the image pixels. This study was a preliminary investigation of a technique to extract electrical parameters from multifrequency images when the reference data set has a reactive component. Unlike the situation in which a homogeneous, resistive data set is available, it is not possible to obtain the impedance and phase information directly from the image pixel values of the MFEIT images data set, as the phase of the reactive reference is not known. The method ...Continue Reading

References

Jan 1, 1992·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·H GriffithsR J Williams
Jan 1, 1987·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·H Griffiths, A Ahmed
Jan 1, 1987·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·D C Barber, A D Seagar
Jan 1, 1987·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·B H Brown, A D Seagar
May 1, 1994·Physiological Measurement·B H BrownK Hatzigalanis
May 1, 1994·Physiological Measurement·B RigaudJ P Morucci
May 1, 1994·Physiological Measurement·H Griffiths, J Jossinet
Mar 1, 1996·Medical & Biological Engineering & Computing·L LuJ P Morucci

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Citations

Mar 17, 2000·Physiological Measurement·O CasasJ Rosell
Jun 19, 2003·Physiological Measurement·Bernhard BrandstätterHermann Scharfetter

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