Effect of electrode size on impedance images of 3-D objects

The sensitivity of an impedance imaging system to small cylindrical inhomogeneities placed in a 3-D saline tank was studied for different height electrodes, and different height targets. Inhomogeneities in the tank having limited vertical extent were detected by electrodes of vertical size comparable to that of the inhomogeneity. Taller electrodes had increased sensitivity to short targets to only a limited extent. When the electrode height was more than twice that of the target, sensitivity was decreased or remained the same with further increases in electrode height