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Table 1 The mean and standard deviation of Dw and Dm in dose-volume indices calculated with Monte Carlo for 10 NPC IMRT cases

From: Clinical evaluation for the difference of absorbed doses calculated to medium and calculated to water by Monte Carlo method

ROI Parameter Dw(Gy) Dm(Gy) Diff(%) p
PTV70 D98% 70.7 ± 0.6 70.2 ± 0.3 0.7 ± 0.5 0.002
D50% 74.3 ± 0.5 73.6 ± 0.3 0.9 ± 0.4 <  0.001
D2% 78.2 ± 1.5 76.7 ± 1.0 1.9 ± 1.1 0.001
PTV66 D98% 64.6 ± 2.1 65.0 ± 2.2 −0.6 ± 0.4 0.002
D50% 69.0 ± 0.6 69.0 ± 0.6 0.1 ± 0.3 0.923
D2% 72.4 ± 1.2 72.1 ± 1.5 0.4 ± 1.0 0.235
PTV60 D98% 63.2 ± 1.1 62.7 ± 1.0 0.7 ± 0.5 0.001
D50% 71.7 ± 0.9 71.1 ± 0.9 0.9 ± 0.3 <  0.001
D2% 77.4 ± 1.3 76.1 ± 0.9 1.7 ± 1.0 <  0.001
PTV54 D98% 56.4 ± 0.7 56.6 ± 0.5 0.2 ± 0.4 0.144
D50% 65.0 ± 1.2 64.7 ± 1.2 0.6 ± 0.3 <  0.001
D2% 76.1 ± 1.2 75.1 ± 0.9 1.3 ± 0.7 <  0.001
Spinal Cord D50% 34.0 ± 1.6 33.9 ± 1.7 0.5 ± 0.3 <  0.001
D2% 39.6 ± 1.2 39.2 ± 1.2 0.8 ± 0.3 <  0.001
Brain Stem D50% 38.2 ± 2.3 38.1 ± 2.2 0.4 ± 0.3 0.002
D2% 57.3 ± 6.8 57.1 ± 6.8 0.3 ± 0.2 <  0.001
Parotids D50% 40.9 ± 7.1 41.0 ± 7.0 −0.1 ± 0.6 0.901
D2% 69.3 ± 1.6 69.2 ± 1.6 0.2 ± 0.3 0.136
Lens D50% 4.4 ± 1.9 4.4 ± 1.9 0.7 ± 0.9 0.019
D2% 6.2 ± 2.8 6.2 ± 2.8 0.2 ± 0.6 0.082
Optic nerves D50% 35.9 ± 21.4 35.5 ± 21.5 1.6 ± 4.4 0.097
D2% 54.1 ± 23.7 53.7 ± 23.4 0.4 ± 0.8 0.078
TM-Joints D50% 44.2 ± 6.4 42.0 ± 6.0 5.1 ± 0.7 <  0.001
D2% 67.2 ± 4.3 64.6 ± 4.2 4.5 ± 1.2 <  0.001
Mid-Ears D50% 43.3 ± 4.1 42.4 ± 3.7 2.1 ± 1.7 0.009
D2% 64.2 ± 4.8 62.0 ± 5.0 3.4 ± 1.7 <  0.001
Mandibles D50% 49.5 ± 6.8 46.8 ± 7.2 5.5 ± 1.8 <  0.001
D2% 67.4 ± 4.4 64.2 ± 4.7 4.8 ± 1.5 <  0.001
Temporal lobe D50% 16.8 ± 7.3 16.7 ± 7.3 0.6 ± 0.7 0.003
D2% 64.2 ± 6.0 63.6 ± 6.0 0.9 ± 0.3 <  0.001
Tongue D50% 47.7 ± 6.7 47.4 ± 6.7 0.6 ± 0.3 <  0.001
D2% 65.3 ± 5.3 65.2 ± 5.5 0.2 ± 0.6 0.340