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Table 1 Change in contact impedance with frequency of all electrode–conductive gel combinations

From: Optimal combination of electrodes and conductive gels for brain electrical impedance tomography

Frequency range Impedance change of different combinations (kΩ)
eA-gA eA-gB eA-gC eA-gD eA-gE eB-gA eB-gB eB-gC eB-gD eB-gE eC-gA eC-gB eC-gC eC-gD eC-gE ECG
100 Hz–10 kHz 20.45 19.42 8.24 24.35 23.80 19.81 18.84 10.92 25.95 23.81 23.07 19.70 20.52 21.25 25.90 19.93
10 kHz–1 MHz 1.21 0.39 0.64 1.61 0.52 0.77 0.62 0.48 0.80 0.86 0.70 0.95 0.42 0.40 0.41 0.73
100 Hz–1 MHz 21.66 19.81 8.88 25.96 24.32 20.58 19.45 11.39 26.76 24.67 23.77 20.65 20.93 21.65 26.31 20.66
  1. ECG electrocardiogram