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Figure 3. Contrast-enhanced CT scans and photographs of lung treated by radiofrequency (RF) ablation using an internally cooled electrode and a multitined expandable electrode in a pig model. (a) Contrast-enhanced axial CT scan obtained immediately after RF ablation showing an RF-induced hyperattenuated region (arrows) in both lungs. Note that the hyperattenuated region in the right lung treated with an internally cooled electrode is similar to that in left lung treated with a multitined expandable electrode. Photographs of gross specimen containing RF-induced coagulation areas created with (b) an internally cooled electrode and (c) a multitined expandable electrode. Ablated tissues appeared as a central, firm, dark-brown area (asterisk) surrounded by an outer, irregular margin (arrows) of bright red tissue. (d) Contrast-enhanced coronal reconstruction image obtained immediately after RF ablation using a perfusion electrode showing RF-induced hyperattenuated regions in the left lung (arrows). Note that the hyperattenuated region in the left lung treated with a perfusion electrode is larger than those produced using an internally cooled electrode (arrowheads) in the right lung. (e) Photographs of a gross specimen containing an RF-induced coagulation area created with a perfusion electrode. Note that the short- and long-axis diameters of the coagulation area were larger in Group B using a perfusion electrode than in the other Groups (a and c).
