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Table 2 Dosimetric parameters comparison for OAR (mean ± standard deviation)

From: VMAT planning study in rectal cancer patients

   IMRT SA-VMAT DA-VMAT P(IMRT vs SA-VMAT) P(IMRT vs DA-VMAT)
Small bowel Dmean (Gy) 12.1 ± 8.0 15.5 ± 7.7 15.3 ± 7.6 0.001 0.002
  D2% (Gy) 35.7 ± 12.1 40.0 ± 10.2 39.6 ± 10.0 0.005 0.009
  V15 (cc) 132.0 ± 110.2 185.8 ± 130.0 186.4 ± 128.8 0.004 0.005
  V30 (cc) 48.8 ± 20.0 77.5 ± 21.0 78.8 ± 21.5 0.001 0.002
Bladder Dmean (Gy) 39.0 ± 3.3 42.2 ± 4.0 40.0 ± 3.6 0.001 0.074
  D2% (Gy) 52.9 ± 0.6 53.2 ± 0.7 52.4 ± 0.5 0.132 0.005
  V30 (cc) 437.1 ± 156.5 479.4 ± 176.5 463.2 ± 191.2 0.061 0.460
  V40 (cc) 281.9 ± 118.9 366.2 ± 155.8 321.1 ± 167.1 0.002 0.140
  V50 (cc) 112.0 ± 55.6 185.7 ± 107.4 151.1 ± 115.6 0.001 0.112
Femur heads Dmean (Gy) 19.9 ± 4.1 23.2 ± 3.4 24.3 ± 2.8 0.025 0.012
  D10% (Gy) 28.2 ± 5.5 29.6 ± 4.3 31.5 ± 4.1 0.173 0.047
Healthy tissues V5 (cc) 9454.9 ± 1999.3 9827.4 ± 2153.3 9815.3 ± 2142.0 0.001 0.001
  V10 (cc) 7833.9 ± 1591.8 8167.6 ± 1789.4 8331.8 ± 1733.7 0.013 0.001
  V20 (cc) 5224.2 ± 1084.5 4721.8 ± 884.3 4750.7 ± 876.5 0.002 0.005
  1. OAR: organ at risk, IMRT: intensity modulated radiotherapy, SA-VMAT: single-arc volumetric modulated arc therapy, DA-VMAT: double-arc volumetric modulated arc therapy.