Analytical and numerical quantification and comparison of the local electric field in the tissue for different electrode configurations

Table 6 Quantification of the electric field strength for in-homogeneousmodels – calculated Ett _min, Ett _maxand E _maxparameters.

Needle electrode configuration	U/d = 1.15 V/cm			U/d = 1300 V/cm
	Target tissue Ett_max(V/cm)	Target tissue Ett_min(V/cm)	Entire tissue E_max(V/cm)	Target tissue Ett_max(V/cm)	Target tissue Ett_min(V/cm)	Entire tissue E_max(V/cm)
2 (Fig. 6a)	0.558	0.364	7.001	628.05	409.9	7887.1
4 (Fig. 6b)	0.572	0.539	6.104	643.4	606.2	6872.5
6 (Fig. 6c)	0.741	0.639	5.339	833.9	718.9	6011.2

Quantification of the electric field strength (E) for in-homogeneous models with needle electrode configurations which are defined in Fig. 2a-c. Conductivity of the target tissue is σtt = 0.4 S/m and the conductivity of the surrounding tissue σst = 0.2 S/m. Calculated minimal E (Ett _min) and maximal E (Ett _max) inside the target tissue and maximal E within the entire tissue E _maxfor different needle electrode configurations. The results for models shown in Figs. 6a-6c were calculated for applied voltage U = 1 V ( $d = 5 \sqrt{3} mm$ ). Furthermore, by scaling the results we also calculated the parameters Ett _min, Ett _maxand E _maxfor U/d = 1300 V/cm.

ISSN: 1475-925X