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. 2021 Apr 15;16:73. doi: 10.1186/s13014-021-01802-9

Table 3.

Biological equivalent dose (BED) and equivalent dose in 2 Gy per fraction (EQD2) for various SRS/HSRT radiation schedules

Dose regimen BED Gy10 (Tumor) EQD10/2 BED Gy2 (Brain Parenchyma) EQD2/2
30 Gy/5 fractions 48 40 120 60
25 Gy/5 fractions 37.5 31.25 87.5 43.75
27 Gy/3 fractions 51.3 42.75 148.5 74.25
24 Gy/3 fractions 43.2 36 120 60
20 Gy/1 fraction 60 50 220 110
18 Gy/1 fraction 50.4 42 180 90
16 Gy/1 fraction 41.6 34.67 144 72
14 Gy/1 fraction 33.6 28 112 56
12 Gy/ 1 fraction 26.4 22 84 42

BED Gy10, biological equivalent dose with an α/β ratio of 10 Gy; BED Gy2, biological equivalent dose with an α/β ratio of 2 Gy; EQD10/2, eqivalent dose in 2 Gy/fractions with a BED Gy10; EQD2/2, eqivalent dose in 2 Gy/fractions with a BED Gy2; SRS, stereotactic radiosurgery; HSRT, hypofractionated stereoactic radiation therapy