Fig. 6. RF ablation under fusion imaging guidance in 67-year-old man with 2.1 cm HCC.

A. Gadoxetic acid-enhanced axial arterial-phase T1-weighted image shows enhancing mass (arrow) in segment 7 of liver. B. Index tumor is not clearly seen on conventional gray-scale US image. HCC = hepatocellular carcinoma, RF = radiofrequency, US = ultrasound C. RF ablation was performed using fusion imaging technique (volume navigation, GE Healthcare). Fused image (left) and its corresponding MR image (right) during procedure show index tumor (T) and transient hyperechoic microbubbles (asterisk). D. Immediate follow-up contrast-enhanced CT image depicts low-attenuated RF ablation zone (asterisk), which sufficiently covers index tumor (arrowhead). HCC = hepatocellular carcinoma, RF = radiofrequency