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Table 1 Dosimetric parameters comparison among IMRT, SA-VMAT and DA-VMAT technique for PTV (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)
Dmean (Gy) 52.0±0.2 52.0±0.4 51.6±0.2 0.167 0.001
D2% (Gy) 54.1±0.2 54.0±0.8 53.1±0.3 0.366 0.001
D98% (Gy) 49.2±0.3 49.3±0.2 49.5±0.2 0.230 0.015
V95 (%) 99.6±0.3 99.9±0.1 99.9±0.1 0.001 0.001
V107 (%) 10.2±5.1 5.3±3.9 0.6±0.4 0.017 0.001
CI 1.23±0.05 1.28±0.07 1.21±0.07 0.006 0.305
MU 499.0±41.6 418.5±41.9 438.8±31.7 0.001 0.001
Treatment time (min) 8.0±0.7 1.5±0.2 3.0±0.3 0.001 0.001
  1. IMRT: intensity modulated radiotherapy, SA-VMAT: single-arc volumetric modulated arc therapy, DA-VMAT: double-arc volumetric modulated arc therapy, PTV: Planning Target Volume, CI: conformity index, MU: monitor units.