Fig. 7
From: Evaluation of particle radiotherapy for the re-irradiation of recurrent intracranial meningioma
Exemplary treatment plan for re-irradiation of a large recurrent meningioma of the skull base. A re-irradiation dose of 17 × 3 Gy(RBE) carbon ions was applied and a dose of 11 × 3,8 Gy photons had been applied one year earlier in a FSRT-setting. Dose to the directly adjoining optic chiasm could be reduced to 11,0 Gy(RBE) mean (33,3 Gy(RBE) max) and dose to the brain stem to 6,5 Gy(RBE) mean (36,3 Gy(RBE) max). CTV is delineated in red and PTV in blue