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Table 3 Dosimetric statistics for the specified OARs

From: Helical tomotherapy for single and multiple liver tumours

Structure Parameter HT SaS-IMRT p
Group 1 -single tumour group
Normal liver Mean (Gy) 18.24 ± 6.73(10.84-31.09) 20.01 ± 7.86 (8.37-31.20) n/a
  V50%(%) 19.17 ± 5.62(10.83-22.50) 22.19 ± 7.13(14.17-31.25) n/a
  EUD 23.68 ± 5.14(16.60-33.97) 29.11 ± 5.46(21.52-37.14) < 0.05
  NTCP 1.69 ± 4.30(0.003-12.33) 6.80 ± 9.86(0.06-29.07) 0.051
Whole liver V30 Gy(%) 36.41 ± 14.88(16.45-62.00) 39.44 ± 16.57(16.94-62.06) n/a
Lt kidney Mean (Gy) 2.48 ± 2.43 (0.30-6.44) 2.83 ± 3.61(0.17-9.00) n/a
Rt kidney Mean (Gy) 4.13 ± 3.09 (0.42-8.03) 5.55 ± 4.55(0.15-10.57) n/a
GIS Max (Gy) 30.18 ± 18.17(8.65-52.56) 32.67 ± 17.27(11.77-53.45) n/a
Spinal cord Max (Gy) 15.30 ± 9.14(5.12-34.28) 22.05 ± 11.10(4.58-34.78) n/a
Group 2 -multiple tumours group
Normal liver Mean (Gy) 25.89 ± 3.43(18.89-28.45) 29.73 ± 6.71 (15.54-36.96) < 0.05
  V50%(%) 36.46 ± 4.92(29.17-41.67) 51.74 ± 11.46(37.5-69.17) < 0.05
  EUD 28.09 ± 3.23(21.95-31.87) 34.68 ± 3.80(27.77-38.43) < 0.05
  NTCP 2.38 ± 2.25(0.07-6.15) 20.27 ± 13.29(1.23-38.33) < 0.05
Whole liver V30 Gy(%) 43.91 ± 10.43(23.12-53.42) 55.00 ± 14.28(27.11-74.97) < 0.05
Lt kidney Mean (Gy) 4.18 ± 2.94 (0.66-9.21) 2.60 ± 2.03(0.37-6.97) n/a
Rt kidney Mean (Gy) 6.11 ± 4.16 (0.99-12.38) 6.45 ± 4.76(0.93-14.58) n/a
GIS Max (Gy) 39.59 ± 12.42(21.42-53.20) 42.05 ± 12.36(19.67-52.78) n/a
Spinal cord Max (Gy) 18.08 ± 5.38(10.58-28.19) 23.66 ± 8.65(8.96-32.20) < 0.05
  1. Abbreviation: SaS-IMRT: Step-and-shoot intensity-modulated radiotherapy;; HT: helical tomotherapy; EUD: Equivalent uniform dose; NTCP: Normal tissue complication probability; GIS: Gastrointestinal system (including stomach and small bowels); Lt: left side; Rt: right side; n/a: not statistical significance; statistical significance (p < 0.05) is reported between couples from the paired Wilcoxon signed-rank test analysis.