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Code-Division-Multiplexed Electrical Impedance Tomography Spectroscopy

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4 Author(s)
McEwan, A. ; Dept. of Med. Phys. & Bioeng., Univ. Coll. London, London, UK ; Tapson, J. ; van Schaik, A. ; Holder, D.S.

Electrical impedance tomography uses multiple impedance measurements to image the internal conductivity of an object, such as the human body. Code-division multiplexing is proposed as a new method that can provide simultaneous impedance measurements of the multiple channels. Code division provides clear advantages of a wide frequency range at reduced cost and reduced complexity of sources. A potential drawback is the lack of perfectly orthogonal code sets. This caused an increase of 0.62% in root-mean-square spectral error when two codes were used to record two impedance channels simultaneously on a low-pass filter network. The method described provides images and spectra which are equivalent to the conventional time-multiplexed method, with increases in frequency resolution and measurement speed which may be of benefit in some applications of electrical impedance tomography spectroscopy.

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Biomedical Circuits and Systems, IEEE Transactions on  (Volume:3 ,  Issue: 5 )