Fig. 1
Cross-section of meninges in brain [4].
Fig. 2
The geometry of electrode and the current direction.
Fig. 3
The geometry of layers.
Table 1
Brain tissue dielectric properties
| Brain layer | Thickness | Conductivity (S/m) | |
|---|---|---|---|
| (a) | Skin (wet) | 0.5 mm | 0.001 |
| Fat | 1 mm | 0.05 | |
| Skull | 7 mm | 0.05 | |
| Dura mater | 0.5 mm | 0.0025 | |
| Arachnoid mater and CSF | 40 μm | 2 | |
| Pia mater | 0.6 mm | 0.05 | |
| Grey matter | ≈ 40 mm | 0.2 |
Fig. 4
Geometry of electrodes on human head (a), and electric field distribution in the head model without and with considering meninges while injected current equal to 2 mA (b and c).
Fig. 5
Electric field in the hypothetical line in the bisector of the electrodes from the center to the skin in the two models.
Fig. 6
Electric field in the hypothetical line from the center of the head model to the center of the anode electrode.