Figure 1

Ablation approach and thermometry slice positioning. (A) Near-field approach: in lesions with (partially) intact cortical bone, treatment cells were positioned 10 mm distal to the cortical bone to generate temperature increase along the cortical surface that intersects the beam path. (B) Direct approach: the treatment cells were positioned on the cortical surface. (C) Soft-tissue approach: in lytic lesions exhibiting complete cortical destruction, treatment cells were positioned within the tumor mass and its close proximity to achieve ablation of possible remaining periosteal nerves and the tumor itself. (D) Position of thermometry slices: the position of the slices relative to the treatment cell (red) is fixed except for the coronal near-field slice.