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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