Multi-frequency static imaging in electrical impedance tomography: Part 1. Instrumentation requirements

Static images of the human body using electrical impedance tomography techniques can be obtained by measuring at two or more different frequencies. The frequencies used depend on the application, and their selection depends on the frequency behaviour of the impedance for the target tissue. An analys...

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Bibliographic Details
Published in:Medical & biological engineering & computing 1995-11, Vol.33 (6), p.784-792
Main Authors: Riu, P J, Rosell, J, Lozano, A, Pallàs-Areny, R
Format: Article
Language:English
Subjects:
Electric Impedance
Electrodes
Electronics, Medical
Humans
Mathematics
Skin Physiological Phenomena
Tomography - instrumentation
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Summary:Static images of the human body using electrical impedance tomography techniques can be obtained by measuring at two or more different frequencies. The frequencies used depend on the application, and their selection depends on the frequency behaviour of the impedance for the target tissue. An analysis using available data and theoretical models for tissue impedance yields the expected impedance and boundary voltage changes, therefore setting the measurement instrument specifications. The instrument errors produced by different sources are analysed, and, from this analysis it is possible to determine the feasibility of building the instrument, the limit values for some parameters (or components) and indications on the most suitable design of critical parts. This analysis also shows what kinds of error can be expected in the reconstructed images. It is concluded that it is possible to build an instrument with limited errors, allowing static images to be obtained. An instrument has been built that meets some of the design requirements and fails in others because of technological problems. In vivo images obtained with this instrument will be presented in Part 2 of this work.
ISSN:0140-0118
1741-0444
DOI:10.1007/bf02523010