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Table 2 Dose-volume indices of the PTV and OARs

From: Reduced lung dose during radiotherapy for thoracic esophageal carcinoma: VMAT combined with active breathing control for moderate DIBH

Variable IMRT-FB VMAT-FB VMAT-DIBH F p
PTV      
D1% (Gy) 65.67 ± 0.41 65.74 ± 0.35 66.10 ± 0.44 2.599 0.098
D99% (Gy) 58.82 ± 0.52 58.76 ± 0.51 58.35 ± 0.41 2.156 0.141
CI 0.90 ± 0.03 0.90 ± 0.03 0.86 ± 0.04 2.864 0.079
HI 1.05 ± 0.02 1.06 ± 0.02 1.07 ± 0.03 2.485 0.107
Total lung      
V5 (%) 83 ± 9 83 ± 9 74 ± 10 2.274 0.128
V10 (%) 64 ± 9 70 ± 10 56 ± 10 4.808 0.019
V20(%) 26. ± 5 24 ± 6 18 ± 4 5.518 0.012
V30 (%) 8 ± 4 8 ± 3 4 ± 2 4.062 0.032
V40 (%) 4 ± 2 4 ± 1 2 ± 0 3.790 0.039
Dmean (Gy) 15.45 ± 2.24 15.30 ± 2.19 12.57 ± 1.78 4.884 0.018
Heart      
V20 (%) 71 ± 2.46 61 ± 2.77 61 ± 2.73 0.336 0.719
V30 (%) 38 ± 2.37 36 ± 2.35 35 ± 2.20 0.032 0.968
V40 (%) 22 ± 1.42 20 ± 1.40 19 ± 1.25 0.097 0.908
Dmean 28.83 ± 8.60 28.82 ± 8.71 27.32 ± 8.53 0.080 0.923
Spinal cord      
Dmax(Gy) 43.54 ± 2.62 44.83 ± 2.19 41.25 ± 4.40 2.542 0.103
Monitor units 798.38 ± 11.20 508.25 ± 6.49 506.88 ± 7.88 29.156 0.000
Treatment time (s) 367.64 ± 3.39 170 ± 0 124 ± 0 349.997 0.000
  1. CI Conformality index, HI Homogeneity index.