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

Table 4 Quantification of electric field strength for needle electrode models – 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. 4a)	0.804	0.527	6.618	905.4	591.7	7450.3
4 (Fig. 4b)	0.824	0.779	5.829	928.7	876.9	6562.5
6 (Fig. 4c)	1.049	0.911	5.166	1180.9	1025.2	5816.6
6 (Fig. 4d)	0.822	0.778	5.794	925.4	875.9	6523.1
6 (Fig. 4e)	1.064	0.835	7.443	1197.9	940.1	8379.6
7 (Fig. 4f)	0.21	~0	5.17	236.4	1.038	5820.8
7 (Fig. 4g)	8.1	0.84	8.1	9119.2	945.7	9119.2

The results for models shown in Figs. 4a – 4e were calculated for applied voltage U = 1 V ( $d = 5 \sqrt{3} mm$ ) and for models shown in Figs. 4f – 4g for applied voltage U = 0.575 V (d = l = 5 mm) giving U/d = 1.15 V/cm. Furthermore, by scaling the results we also calculated the parameters Ett _min, Ett _maxand E _maxfor U/d = 1300 V/cm.

ISSN: 1475-925X