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Table 3 Summary of OARs and NT dose distribution for VMAT-S, IMRT and HT plans x ¯ ± σ

From: SmartArc-based volumetric modulated arc therapy for endometrial cancer: a dosimetric comparison with helical tomotherapy and intensity-modulated radiation therapy

Structures   V10 V20 V30 V40 V50 Dmean(Gy)
Bowel Mean (VMAT-S) 0.88 0.70 0.39 0.22 0.08 27.35
Mean (IMRT) 0.83 0.66 0.40 0.22 0.09 26.72
P 0.02 0.03 0.15 0.27 0.39 0.02
Mean (HT) 0.91 0.72 0.38 0.19 0.08 26.91
P 0.07 0.08 0.13 0.10 0.61 0.03
Rectum Mean (VMAT-S) 0.99 0.96 0.82 0.54 0.25 40.33
Mean (IMRT) 0.98 0.96 0.93 0.63 0.27 42.40
P 0.19 0.52 0.03 0.00 0.06 0.01
Mean (HT) 1.00 0.98 0.85 0.57 0.25 40.99
  P 0.21 0.31 0.31 0.08 0.36 0.12
Bladder Mean (VMAT-S) 1.00 0.96 0.67 0.35 0.16 36.23
Mean (IMRT) 0.99 0.91 0.70 0.38 0.17 36.33
P 0.36 0.03 0.03 0.04 0.37 0.17
Mean (HT) 1.00 0.86 0.65 0.33 0.14 35.09
P 0.52 0.02 0.16 0.08 0.38 0.06
Pelvic bones Mean (VMAT-S) 0.91 0.73 0.40 0.22 0.08 27.85
Mean (IMRT) 0.84 0.65 0.45 0.25 0.09 27.28
P 0.00 0.00 0.03 0.03 0.17 0.13
Mean (HT) 0.91 0.69 0.41 0.24 0.09 28.22
  P 0.51 0.08 0.07 0.06 0.53 0.61
Normal tissue Mean (VMAT-S) 0.79 0.45 0.21 0.11 0.05 20.48
Mean (IMRT) 0.68 0.42 0.21 0.12 0.05 19.77
P 0.00 0.03 0.15 0.15 0.25 0.08
Mean (HT) 0.81 0.42 0.17 0.06 0.03 20.56
  P 0.35 0.10 0.07 0.09 0.12 0.15
  1. OARs: organs at risk, NT: normal tissue, VMAT-S: volumetric modulated arc therapy with SmartArc, IMRT: intensity-modulated radiotherapy, HT: helical tomotherapy, V10, V20, V30, V40 and V50: the percentage volume of the OARs and NT receiving a dose of 10, 20, 30, 40 and 50 Gy, respectively, D mean: mean dose.