Fig. 3
From: Optimal combination of electrodes and conductive gels for brain electrical impedance tomography
a Normalized contact impedance of all electrode–conductive gel combinations measured at 1 kHz. b Normalized mean change in contact impedance of all combinations with time measured for 1 h at 1 kHz. c Mean change in contact impedance of all combinations during each sub-time frame. d Score of all combinations with regard to the time property of contact impedance,*p < 0.05