Figure 2a:

(a) Graphs show ablation diameter, length, and aspect ratio of ex vivo ablations comparing dual-slot with monopole antennas. Solid dots represent sample mean, and horizontal line segments represent standard deviation. * = significant difference (P < .05). (b) Sample ablation zone created by dual-slot (left) and monopole (right) antennas at 100 W for 5 minutes. Dual-slot antenna created significantly shorter and more spherical ablation zone than did monopole antenna at 50 W for 2 and 5 minutes. Dual-slot antenna created a significantly wider and more spherical ablation zone compared with monopole antenna at 100 W for 2 minutes.