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Fig. 2. Response contours of 50°C temperature isotherms.
Effective radiofrequency energy for ablation is considered to be thermal dose
of 50-54°C for 4-6 min. We therefore selected 50°C isotherm to allow
standardized means of comparison. Figure represents color-coded schematic
depiction of 50°C temperature isotherms versus distance from 3-cm
internally cooled electrode. Blue represents parameters that can successfully
heat 3-cm zone of ablation, whereas red denotes greater than 7 cm.