Fig 10. RBE for the selected volumetric dose distribution of CIBs with a field size of 60 × 60 mm² and a range of 150 mm as a function of SOBP size from 30 to 120 mm.

The RBE values calculated using VQA Plan and Xio-N and the difference between the two are shown as a solid line with circles, dashed line with squares, and dotted line with triangles, respectively.