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. 2013 Oct 14;8:237. doi: 10.1186/1748-717X-8-237

Table 3.

Dosimetric comparison of normal tissues in all four radiotherapy plan groups (Gy)

 
 VMAT1 VMAT2
 dIMRT
 ssIMRT
 pGLM-u
 pVMAT1
 pVMAT1
 pVMAT1
 pVMAT2
 pVMAT2
 pdIMRT
          -VMAT2 -dIMRT -ssIMRT -dIMRT -ssIMRT -ssIMRT
Brain stem
 D2%
 41.21 ± 0.92
 41.94 ± 0.42
 42.56 ± 0.48
 46.32 ± 0.44
 0.024
 0.679
 0.444
 0.005
 0.724
 0.015
 0.036
Dmean
 24.02 ± 2.58
 23.46 ± 3.97
 24.85 ± 3.86
 27.51 ± 0.41
 <0.001
 0.326
 0.056
 <0.001
 0.117
 <0.001
 <0.001
Spinal-cord
 D2%
 35.15 ± 1.75
 32.59 ± 2.91
 33.60 ± 2.67
 28.66 ± 3.02
 <0.001
 0.001
 0.073
 <0.001
 0.160
 <0.001
 <0.001
Dmean
 26.26 ± 2.66
 23.46 ± 2.74
 25.01 ± 2.79
 22.3 ± 3.52
 <0.001
 <0.001
 0.055
 <0.001
 0.017
 0.071
 0.001
Chiasm
 Dmax
 47.51 ± 4.52
 47.89 ± 5.01
 47.17 ± 5.83
 48.23 ± 6.32
 0.600
  
  
  
  
  
  
Dmean
 34.44 ± 6.88
 36.38 ± 5.79
 35.30 ± 5.46
 36.37 ± 7.30
 0.013
 0.033
 0.427
 0.023
 0.330
 0.988
 0.337
Optic N L
 Dmax
 43.73 ± 10.41
 46.20 ± 9.77
 44.13 ± 9.52
 45.11 ± 10.00
 0.177
  
  
  
  
  
  
Dmean
 24.17 ± 9.69
 26.17 ± 9.69
 24.40 ± 8.29
 26.22 ± 9.24
 0.022
 0.021
 0.787
 0.018
 0.07
 0.955
 0.065
Optic N R
 Dmax
 43.30 ± 11.85
 44.88 ± 9.57
 42.04 ± 10.18
 44.84 ± 8.91
 0.048
 0.177
 0.278
 0.188
 0.017
 0.971
 0.018
Dmean
 25.04 ± 9.69
 25.66 ± 9.53
 23.92 ± 8.74
 26.04 ± 9.15
 0.076
  
  
  
  
  
  
Lens L
 Dmean
 3.86 ± 1.35
 4.13 ± 1.49
 4.18 ± 1.38
 5.18 ± 1.53
 <0.001
 0.111
 0.06
 <0.001
 0.767
 <0.001
 <0.001
Lens R
 Dmean
 3.71 ± 1.05
 4.35 ± 1.7
 4.21 ± 1.21
 5.22 ± 1.38
 <0.001
 0.004
 0.022
 <0.001
 0.535
 <0.001
 <0.001
Parotid L
 D50%
 28.45 ± 4.20
 27.04 ± 4.99
 23.89 ± 4.05
 26.73 ± 4.09
 <0.001
 0.064
 <0.001
 0.025
 <0.001
 0.682
 <0.001
Dmean
 32.20 ± 3.30
 31.57 ± 3.86
 29.01 ± 3.31
 31.48 ± 3.21
 <0.001
 0.223
 <0.001
 0.165
 <0.001
 0.863
 <0.001
Parotid R
 D50%
 31.73 ± 5.88
 28.18 ± 5.38
 25.42 ± 5.53
 27.07 ± 3.79
 <0.001
 0.001
 <0.001
 <0.001
 0.008
 0.273
 0.104
Dmean
 34.14 ± 3.56
 32.47 ± 3.83
 30.11 ± 3.93
 31.65 ± 3.08
 <0.001
 0.085
 <0.001
 0.001
 0.001
 0.238
 0.097
Oral cavity
 Dmean
 40.35 ± 4.77
 36.99 ± 6.18
 41.42 ± 6.77
 43.21 ± 5.60
 <0.001
 <0.001
 0.230
 0.002
 <0.001
 <0.001
 0.049
Larynx Dmean 37.67 ± 4.13 35.17 ± 4.55 35.86 ± 3.05 34.76 ± 3.82 <0.001 0.001 0.003 <0.001 0.249 0.395 0.048

GLM-u: general linear model-univariate; VMAT1: single arc VMAT, VMAT2: dual arc VMAT; dIMRT: dynamic MLC IMRT; ssIMRT: step-and-shoot IMRT. Lens L, left lens; Lens R, right lens; Optic L, left optic nerve; Optic R, right optic nerve; Parotid L, left parotid; Parotid R, right parotid. “Bold numbers” means that p value has a statistically significance.