A reconstruction algorithm for electrical impedance tomography data collected on rectangular electrode arrays

A three-dimensional reconstruction algorithm in electrical impedance imagin g is presented for determining the conductivity distribution beneath the su rface of a medium, given surface voltage data measured on a rectangular arr ay of electrodes. Such an electrode configuration may be desirable for usin g electrical impedence tomography to detect tumors in the human breast. The algorithm is based on linearizing the conductivity about a constant value. Here, me describe a simple implementation of the algorithm on a four-elect rode-by-four-electrode array and the reconstructions obtained from numerica l and experimental tank data. The results demonstrate significantly better spatial resolution in the plane of the electrodes than with respect to dept h.