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Table 1 Dosimetric parameters reported by IROC–H [11] for 6 MV beams from Clinac 2100 linacs, and for 6 MV FFF beams from TrueBeam linacs

From: PRIMO Monte Carlo software benchmarked against a reference dosimetry dataset for 6 MV photon beams from Varian linacs

Parameter Field size (cm2) N Clinac 2100 N TrueBeam
PDD at dmax 10 ×10 116 11
PDD at 5, 15, and 20 cm 6 ×6 99 11
  10 ×10 116 11
  20 ×20 99 11
Off-axis ratios at 5 cm left, 40 ×40 116 11
10 cm avg.,    
and 15 cm left    
Open field OF at dmax 6 ×6 104 11
  15 ×15   
  20 ×20   
  30 ×30   
IMRT-style OF at 10 cm 2 ×2 4 11
  3 ×3   
  4 ×4   
  6 ×6   
SBRT-style OF at 10 cm 2 ×2 20 4
  3 ×3   
  4 ×4   
  6 ×6   
  1. N represents the number of linacs studied for each parameter. Data for Clinac 2100 were taken from the class ‘2100’, except for the SBRT–style OF, which were taken from the class ‘Base’. Data for TrueBeam were taken from the class ‘TB–FFF’