Electrical Impedance Tomography

Electrical Impedance Tomography with compensation for electrode positioning

BH Blott, GJ Daniell and S Meeson

Department of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ. UK.

Ideally EIT should not be oversensitive to electrode positions, but this conflicts with efforts to produce high resolution images. Two procedures are presented that balance reducing the sensitivity to electrode position errors with generating practicable EIT images. The first provides a criterion based on electrode sensitivity for regularising the reconstruction through spectral expansion. The main consequences of this are that smoother images are produced and the number of artefacts and their magnitude are generally reduced. The second modification uses the recorded data to compensate for electrode movements that have occurred after the reference data were measured. Image smoothness is used as a criterion for the readjustment. Computer simulation tests have shown that this modification produces improved image fidelity.

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Last modified 28th October 2000

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