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Fig. 3B. —Computer representation of construction of six-sphere thermal ablation model. Six-sphere ablation model is constructed by performing four ablations in the x-y plane (A-C sequentially) and two along the z-axis (D). Green sphere represents total volume of tissue requiring ablation (tumor plus 1-cm tumor-free margin), and red spheres represent individual thermal ablation spheres that are being overlapped. Largest composite ablation sphere is created when all spheres are overlapped by approximately 23% of diameter.