Effect of limited voltage resolution on an algorithm for determining electrode positions from impedance
An algorithm that adjusts the positions of electrodes in space to provide the best fit to impedance data is presented. The performance of this algorithm was tested in a simulation, to determine the effect of limiting the resolution of the input voltage data. In an infinite volume, the voltage produced on 63 electrodes was determined as current was delivered through 10 electrode pairs. The voltages were truncated to resolutions from 2% to 0.002% of full scale and input to the search algorithm. It is shown that for a fixed number of iterations, a resolution of less than 2% of full scale is needed for the algorithm to converge toward the true solution. Any resolution less than 0.10% of full scale causes the algorithm to perform as well as it does with no truncation error.
