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Table 1 Dose objectives for each fractionation regimen, based on standard linear-quadratic model biologically effective doses calculated with α/β=3

From: Stereotactic ablative radiotherapy for ultra-central lung tumors: prioritize target coverage or organs at risk?

Structure Volume (cm3) 5 fraction 8 fraction 15 fraction
DV (Gy) Dmax (Gy) DV (Gy) Dmax (Gy) DV (Gy) Dmax (Gy)
Trachea and ipsilateral bronchus < 4 18 (3.6/fx) 38 (7.6/fx) 21 (2.6/fx) 46 (5.8/fx) 25.5 (1.7/fx) 58.5 (3.9/fx)
Spinal cord < 0.25 22.5 (4.5/fx) 30 (6.0/fx) 26.5 (3.3/fx) 36 (4.5/fx) 32 (2.1/fx) 45 (3.0/fx)
Spinal cord < 1.2 13.5 (2.7/fx)   15.5 (1.9/fx)   18 (1.2/fx)  
Esophagus < 5 27.5 (5.5/fx) 35 (7.0/fx) 32.5 (4.1/fx) 42 (5.3/fx) 41 (2.7/fx) 53 (3.5/fx)
Ipsilateral brachial plexus < 3 30 (6.0/fx) 32 (6.4/fx) 36 (4.5/fx) 38.5 (4.8/fx) 45 (3.0/fx) 48 (3.2/fx)
Heart/pericardium < 15 32 (6.4/fx) 38 (7.6/fx) 38.5 (4.8/fx) 46 (5.8/fx) 48 (3.2/fx) 58 (3.9/fx)
Great vessels < 10 47 (9.4/fx) 53 (10.6/fx) 57.5 (7.2/fx) 65 (8.1/fx) 74 (4.9/fx) 84 (5.6/fx)
Skin < 10 30 (6.0/fx) 32 (6.4/fx) 36 (4.5/fx) 38.5 (4.8/fx) 45 (3.0/fx) 48 (3.2/fx)
Lung (right and left) 1500 12.5 (2.5/fx)   14 (1.8/fx)   16.5 (1.1/fx)  
Lung (right and left) 1000 13.5 (2.7//fx)   15.5 (1.9/fx)   18 (1.2/fx)  
  1. D V allowable dose to the volume, D max maximum point dose, fx fraction