Apart from ablation time and expanded length, the applied voltage/power also plays an important part in the determination of RFA lesions. Within our investigated range, the ablated volume peaks at around 12V and it overpasses 4 times of the volume at 8V, Figure 10D. In fact, low voltage/power heat the nearby tissue slowly and the overheating of tissue doesn’t occur within the investigated range (curves of 8V and 10V in Figure 12). In contrast, high voltage/power heat the tissue rapidly, and the higher the voltage/power is, the earlier overheating occurs (curves of 12V-18V in Figure 12). Therefore, it’s also important to choose a proper voltage for RFA planning. As our sub-electrodes are individually-controlled, any sub-electrodes can be expanded on demand to enlarge the ablated volume of electrode, Figure 10E. Moreover, by expanding all of the three stylets and cannulas individually in a different setting, it will consequently result in distinct shape and volume of RFA lesions, Figure 10F.