Table 2 Different dosimetric parameters (i.e., Paddick CI, CI, GI with different margins, and normal brain volumes [cc] receiving ≥ 23Gy, 18Gy, 12Gy, 8Gy, and 5Gy for the different treatment techniques). All values indicate Median ± Standard deviation

0.65 ± 0.17

1.43 ± 0.83

3.85 ± 1.41

7.32 ± 3.77

12.05 ± 16.44

  13.6 ± 8.22

49.25 ± 26.9

  197.6 ± 114.79

571.65 ± 188.45

1055.9 ± 173.03

  0.8 ± 0.12

  1.2 ± 0.33

4.93 ± 1.96

7.33 ± 3.87

  7.98 ± 5.88

  10.3 ± 7.07

  29.1 ± 18.72

    88.2 ± 75.21

  249.1 ± 154.72

  793.7 ± 237.9

0.52 ± 0.16

1.86 ± 1.31

2.89 ± 1.3

4.69 ± 2.43

  6.67 ± 5.74

19.85 ± 10.93

  44.6 ± 32.35

157.25 ± 93.52

     381 ± 155.9

856.95 ± 215.73