Figure 1. Experimental apparatus. An internally cooled RF electrode (white arrow) has been inserted into a NaCl gel–filled well within an agar phantom. The RF electrode has been placed in a saline bath at a fixed distance from the grounding pad (G). Thermocouple probes (solid black arrows) have been inserted to measure temperature. An acrylic guide (open arrow) ensures proper positioning of the thermocouple. The RF generator and a temperature measurement device can be seen in the background.