Table 2.

Relevant physical values for BBB stimulation

Property	Value	Reference
Trans-endothelial electrical resistance (TEER)	1500–8000 Ω cm2	[59]
Density, brain tissue	1.03 g/cm3	[60]
Conductivity, brain tissue	0.258 S/m	[61]
Volume specific surface area, BBB	150–200 cm2/g tissue	[59]
Total surface area, BBB (in adults)	12–18 m2	[59]
Acoustic attenuation, brain tissue	0.8 dB/cm*MHz	[62]
Safe electric current density, brain tissue	0.06 mA/m2	[63]
Safe electric charge injection capacity	0.054  C/m2	[63]
Thermal conductivity, brain tissue	0.527W/mC	[64]
Thermal attenuation coefficient, brain tissue	35.2/cm	[64]
Diffusivity	1.3 10–7 m2/s	[64]