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Table 1 Effect of perfusion distance on coagulation volume, diameter and shape

From: RF tumor ablation with internally cooled electrodes and saline infusion: what is the optimal location of the saline infusion?

Perfusion distance (mm)

0 (n = 4)

2 (n = 5)

4 (n = 6)

P*

Volume size (cm 3 )

53.0 ± 15.0

91.7 ± 18.2

63.9 ± 11.7

<0.05

Axial diameter (cm)

6.2 ± 1.0

6.0 ± 0.2

5.2 ± 0.5

NS

Minimum transverse diameter (cm)

4.0 ± 0.4

5.3 ± 0.5

4.5 ± 0.8

<0.05

Maximum transverse diameter (cm)

4.0 ± 0.4

5.5 ± 0.5

5.2 ± 0.5

<0.05

Sphericity †

1.5 ± 0.2

1.1 ± 0.1

1.1 ± 0.2

<0.01

  1. The perfusion distance was defined as the shortest distance between the saline outlet and the surface of the internally cooled electrode
  2. * Overall statistical significance. Statistically significant (P < 0.05). NS: no significant differences
  3. † Fraction of the largest and the average of the two remaining diameters of the thermal lesion (see text)