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Title of Journal: Ann Biomed Eng

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Abbravation: Annals of Biomedical Engineering

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Springer US

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DOI

10.1007/bf03302480

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1573-9686

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A DSP Based MultiFrequency 3D Electrical Impedanc

Authors: Mehran Goharian Manuchehr Soleimani Aravinthan Jegatheesan Kenrick Chin Gerald R Moran
Publish Date: 2008/07/16
Volume: 36, Issue: 9, Pages: 1594-1603
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Abstract

This paper describes the design of a multifrequency Electrical impedance tomography EIT system which provides a flexible mechanism for addressing up to 48 electrodes for imaging conductivity and permittivity distributions A waveform generator based on a digital signal processor is used to produce sinusoidal waveforms with the ability to select frequencies in the range of 01–125 kHz A software based phasesensitive demodulation technique is used to extract amplitudes and phases from the raw measurements Signal averaging and automatic gain control are also implemented in voltage and phase measurements System performance was validated using a CardiffCole Phantom and a saline filled cylindrical tank The signaltonoise ratio SNR using saline tank was greater than 60 dB and the maximum reciprocity error less than 4 for most frequencies The commonmode rejection ratio CMRR was nearly 60 dB at 50 kHz Image reconstruction performance was assessed using data acquired through a range of frequencies This EIT system offers image reconstruction of both conductivity and permittivity distributions in three dimensions The imaging results are presented in time difference and frequency difference imaging

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