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Table 3 Comparison of dosimetric parameters (mean ± standard) for OARs among HT, P-VMAT and DA-VMAT

From: Application of piecewise VMAT technique to whole-brain radiotherapy with simultaneous integrated boost for multiple metastases

Parameters

DA-VMAT

P-VMAT

HT

Lens L

   

 Dmax (Gy)

7.25 ± 0.89

8.26 ± 0.88

8.04 ± 1.34

 Dmean (Gy)

5.92 ± 0.73

6.73 ± 0.80

6.47 ± 0.74

Lens R

   

 Dmax (Gy)

7.29 ± 0.64

8.23 ± 0.53

8.03 ± 0.93

 Dmean (Gy)

5.90 ± 0.61

6.89 ± 0.33

6.43 ± 0.55

Hippocampus L

   

 Dmax (Gy)

44.48 ± 5.34

42.61 ± 5.19

51.49 ± 10.20

 Dmean (Gy)

36.76 ± 3.34

34.58 ± 2.89

40.66 ± 6.32

Hippocampus R

   

 Dmax (Gy)

44.97 ± 4.80

42.23 ± 5.40

50.48 ± 9.16

 Dmean (Gy)

37.73 ± 3.64

35.43 ± 2.83

40.47 ± 6.12

Optic nerve L

   

 Dmax (Gy)

44.56 ± 2.90

41.51 ± 3.58

47.26 ± 4.76

 Dmean (Gy)

32.68 ± 4.27

32.30 ± 4.48

39.22 ± 2.49

Optic nerve R

   

 Dmax (Gy)

45.65 ± 4.12

41.84 ± 3.25

47.18 ± 4.34

 Dmean (Gy)

33.52 ± 5.21

32.41 ± 5.24

39.66 ± 2.56

Optic chiasm

   

 Dmax (Gy)

49.22 ± 3.37

45.47 ± 3.11

51.87 ± 6.54

 Dmean (Gy)

43.49 ± 1.59

41.08 ± 1.43

43.01 ± 1.18

Spinal cord

   

 Dmax (Gy)

30.09 ± 8.51

30.64 ± 8.35

42.35 ± 3.07

Brain stem

   

 Dmax (Gy)

53.91 ± 4.75

51.32 ± 5.98

50.74 ± 5.80