Jc. Newell et al., EFFECT OF ELECTRODE SIZE ON IMPEDANCE IMAGES OF 2-DIMENSIONAL AND 3-DIMENSIONAL OBJECTS, IEEE transactions on biomedical engineering, 45(4), 1998, pp. 531-534
The sensitivity of an impedance imaging system to small cylindrical in
homogeneities in two-dimensional (2-D) and three-dimensional (3-D) sal
ine tanks was studied for different height electrodes and different he
ight targets. Experimental results were compared with analytical model
s. Inhomogeneities in the 3-D tank having limited vertical extent were
detected by electrodes of vertical size comparable to that of the inh
omogeneity. Taller electrodes had increased sensitivity to short targe
ts to only a limited extent. When the electrode height was more than t
wice that of the target, sensitivity decreased or remained the same wi
th further increases in electrode height. The system was less sensitiv
e to inhomogeneities in the 3-D tank than to those in the 2-D tank. Th
e distinguishability of conductors was greater than that of insulators
in the 3-D tank, and the opposite was true in the 2-D tank, consisten
t with an analytical result.