Performance Comparison of Six Bio-electrodes in Brain Electrical Impedance Tomography

Objective To compare the performances of six bio-electrodes in brain electrical impedance tomography(EIT) to obtain the most suitable one.Methods 2-electrode and 16-electrode measurements were chosen respectively to measure the impedance of forearm and brain for ten different subjects.The performance of each electrode system was assessed in contact impedance,signal-to-noise ratio(SNR),uniformity and stability.Results Hot dip coating Ag/AgCl electrode showed a better performance with lower contact impedance,higher SNR and better uniformity and stability.Conclusion With improving and optimizing,the hot dip coating Ag/AgCl electrode is likely to be selected as the most suitable electrode system for brain EIT and can provide technology support for the in-depth study of brain EIT.