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Table 5 Calculated values of U c and corresponding Ett min , Ett max and E max for needle electrodes.

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

Needle electrode Configuration

Target tissue

Ettmax(V/cm)

Target tissue

Ettmin(V/cm)

Entire tissue

Emax(V/cm)

Needed voltage on the electrodes-Uc (V)

2 (Fig. 4a)

1983.3

U/d = 1300

16325.0

2466.8

4 (Fig. 4b)

1376.8

U/d = 1300

9727.4

1668.8

6 (Fig. 4c)

1496.9

U/d = 1300

7371.9

1427.0

6 (Fig. 4d)

1373.2

U/d = 1300

9625

1670.0

6 (Fig. 4f)

1653.7

U/d = 1300

11558.7

1557.0

7 (Fig. 4f) *

/

/

/

/

7 (Fig. 4g)

12536

U/d = 1300

12536

889.88

  1. *With this specific configuration of polarities (Fig. 4f) we can not achieve Et min = U/d (Et min ~0), since the electric field intensity inside the target tissue is almost zero (Et min ~0) and therefore is this configuration suitable only in a combination with the configuration as shown in Fig. 4g.