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Table 3 Different fractionation schemes and their absolute frequencies listed by tumor histology. To facilitate comparison between fractionation schemes equivalent doses in 2 Gy fractions (EQD2) for an assumed α/β of 2 have been calculated.

From: Evaluation of particle radiotherapy for the re-irradiation of recurrent intracranial meningioma

Histology fractionation cumulative dose (Gy(RBE)) EQD2 (Gy(RBE)) n= median cumulative EQD2 (Gy(RBE))
WHO I C12: 15 × 3 45 56,3 2 52,4
  H1: 32 × 1,8 57,6 54,7 2  
  C12: 17 × 3 51 63,8 1  
  H1: 29 × 1,8 52,2 49,6 1  
  C12: 25 × 2 50 50,0 1  
  C12: 16 × 3 48 60,0 1  
  H1: 30 × 1,5 45 39,4 1  
  C12: 12 × 3 36 45,0 1  
WHO II C12: 17 × 3 51 63,8 10 60,0
  C12 Boost after 50 Gy photon RT: 6 × 3 68 72,5 3  
  C12: 13 × 3 39 48,8 2  
  C12: 15 × 3 45 56,3 2  
  C12: 19 × 3 57 71,3 1  
  H1: 27 × 2 54 54,0 1  
  H1: 30 × 1,8 54 51,3 1  
  H1: 25 × 2 50 50,0 1  
  C12: 15 × 3,3 49,5 65,6 1  
  C12: 20 × 3 60 75,0 1  
  C12: 18 × 3 54 67,5 1  
  H1: 20 × 2 40 40,0 1  
  C12 Boost after 50 Gy photon RT: 5 × 3 65 68,8 1  
WHO III C12: 17 × 3 51 63,8 3 56,3
  C12: 15 × 3 45 56,3 2  
  C12: 13 × 3 39 48,8 1