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(a) By placing an ROI point (hotkey “P”) in the 2D viewer on the surface of the skin in the axial section, the surgeon can project and mark the borders of the tumor over the surface of the cranium. (b) Then, the surgeon can outline the borders of the tumor in the 2D viewer by selecting the “open polygon” tool after the 3D reconstruction images are exported from the 3D viewer. (For details, see video 4.)
