Fig. 4.

A double-ablation zone created by overlapping ablation spheres by 23% of their diameter (interval between electrode tips: 3.2 cm).

A. Photograph of longitudinal section of the specimen shows an ablation zone with a fissure (curved arrow) measuring 7.4 cm transversely and 4.0 cm longitudinally. It is delimited by three concentric areas: a pale central core, middle hemorrhagic or red rim (arrowhead), and an outer pink rim (arrow) of variable thickness that merges with normal liver.

B. T2-weighted FSE (TR 3084/TE 104) coronal image depicts a low-signal zone (arrows).

C. Three-dimensional ablation zone reconstructed from MR images appears as a composite ellipsoid with no definite fissure.