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An experimental study in electrical impedance tomography using backprojection reconstruction.

R Guardo¹, C Boulay, B Murray

¹Institut de Génie Biomedical, Ecole Polytechnique, Université de Montréal, Québec, Canada.

IEEE Transactions on Bio-Medical Engineering

|July 1, 1991

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This study evaluated the equipotentials backprojection method for electrical impedance tomography (EIT). Results show sensitivity to target position, suggesting feasibility for 3D imaging and guiding interpretation of complex conductivity distributions.

Area of Science:

Biomedical Engineering
Medical Imaging
Electrical Engineering

Background:

Electrical Impedance Tomography (EIT) shows promise for medical imaging.
Evaluating reconstruction algorithms is crucial for EIT system development.

Purpose of the Study:

To assess the performance of the equipotentials backprojection method in EIT.
To determine system sensitivity to target characteristics and position within a torso-like phantom.

Main Methods:

Experiments were conducted using a saline tank mimicking human torso dimensions.
Nonconducting spherical targets were imaged using a computer-based EIT instrument.
Data acquisition involved current injection on two planes and potential measurements on a third.

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Main Results:

System sensitivity was evaluated based on relative contrast in reconstructed images.
Sensitivity was maximal when sphere centers were on the recording plane, decreasing with radial displacement.
Feasibility of 3D target localization using multi-plane data was demonstrated.

Conclusions:

The equipotentials backprojection method shows potential for EIT applications.
Results provide practical guidelines for interpreting EIT images of complex 3D conductivity variations.
Further development may enable accurate 3D imaging of internal conductivity distributions.