Fig. 4. Diagram and US images immediately after RFA and at the first follow-up.
Diagram (A) and US image (B) show a nodule immediately after RFA. As there is marked swelling due to the hemorrhage and edema, an accurate measurement of both Vtinitial and Vainitial is not possible. Diagram (C) and US image (D) show the nodule at the first follow-up. The swelling has been absorbed and measurements can be made accurately. The arrows and arrowheads in D indicate the deeper margins of Vt and Va, respectively. IAR, initial ablation ratio; RFA, radiofrequency ablation; US, ultrasonography; Va, ablated volume; Vt, total volume; Vv, viable volume.