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Table 1 Treatment plan comparison for patient I, II, III and IV.

From: Evaluation of volumetric modulated arc therapy (VMAT) with Oncentra MasterPlan® for the treatment of head and neck cancer

  Patient I         
   IMRT s4°150s d4°300s d2°300s d6°300s d4°200s d4°400s Goal
  D 95% 58.2 56.6 57.9 57.7 57.4 58.0 57.6 57.0
PTV D 5% 61.4 62.3 61.8 62.1 62.1 61.6 62.5 64.2
  H 5.3 9.5 6.5 7.3 7.8 6.0 8.2 lower
  CI (%) 0.98 0.94 0.98 0.97 0.96 0.98 0.98 1.0
Parotid le D 50% 23.6 21.7 20.4 20.0 20.1 19.7 17.0 28
Parotid ri D 50% 22.5 20.4 19.0 20.1 19.2 18.9 17.1 28
Brain stem D 1ccm 43.2 44.5 44.1 42.6 42.9 44.4 44.3 50
Spinal cord D 1ccm 46.4 50.9 44.1 43.7 45.0 44.1 44.0 48
  MU 591.7 458.6 711.5 725.8 632.2 678.4 711.8 lower
  treat. time (s) 686 116 200 222 225 235 207 lower
  Patient II         
  D 95% 54.2 53.2 53.9 53.7 54.0 52.9 53.9 53.5
PTV D 5% 57.9 58.4 58.1 58.9 58.0 58.2 59.3 60.2
  H 6.8 9.3 7.5 9.4 7.2 9.4 9.6 lower
  CI (%) 0.97 0.94 0.97 0.95 0.97 0.92 0.97 1.0
Parotid le D 50% 12.4 10.8 12.1 15.1 12.2 13.7 12.4 23
Parotid ri D 50% 10.7 17.3 11.3 16.1 11.5 13.7 11.4 23
Brain stem D 1ccm 33.6 30.9 29.7 31.9 30.8 37.9 30.1 41
Spinal cord D 1ccm 35.7 37.5 35.8 33.8 35.5 36.0 35.6 40
  MU 648.9 581.2 600.8 608.9 565.6 638.2 607.6 lower
  treat. time (s) 729 120 225 264 227 279 248 lower
  Patient III         
  D 95% 51.5 51.2 51.6 50.5 51.3 52.0 51.4 51.3
PTV D 5% 55.5 55.9 55.4 56.0 55.7 55.3 55.3 57.8
  H 7.4 8.7 6.9 10.2 8.1 6.2 7.2 lower
  CI (%) 0.96 0.95 0.96 0.92 0.95 0.97 0.95 1.0
Parotid le D 50% 28.0 27.7 27.2 26.1 26.2 27.2 26.4 24
Parotid ri D 50% 27.0 24.7 24.1 24.0 24.5 23.5 24.5 24
Brain stem D 1ccm 36.5 35.6 31.9 38.2 31.9 31.5 31.6 43
Spinal cord D 1ccm 40.7 40.8 39.3 42.0 39.1 38.6 39.2 41
  MU 596.1 515.6 584.1 664.2 556.4 589.2 618.8 lower
  treat. time (s) 753 115 225 303 213 240 246 lower
  Patient IV         
  D 95% 51.5 49.7 49.8 46.4 51.1 51.0 50.8 51.3
PTV D 5% 55.4 56.5 55.9 59.8 58.0 55.6 56.1 57.8
  H 7.2 12.6 11.3 24.8 12.8 8.5 9.8 lower
  CI (%) 0.95 0.90 0.92 0.74 0.94 0.94 0.93 1.0
Spinal cord D 1ccm 8.8 16.2 13.6 15.4 16.3 14.5 13.1 48
Brain stem D 1ccm 43.0 51.4 36.6 34.5 38.4 36.8 37.3 50
Optic nerve le D 1ccm 54.0 53.2 53.8 49.5 53.3 52.8 52.5 55
Optic nerve ri D 1ccm 53.1 50.4 53.0 49.1 52.1 51.5 51.8 55
Chiasm D 1ccm 29.5 30.2 27.2 27.5 25.5 24.9 25.5 50
Bulbus oculi le D med 17.0 17.3 14.9 14.2 14.0 14.3 13.7 20
Bulbus oculi ri D med 18.9 13.1 13.5 13.8 12.5 13.0 12.5 20
  MU 464.9 409.8 462.5 598.4 445.0 477.7 450.9 lower
  treat. time (s) 641 96 143 223 154 153 139 lower
  1. Dmax is defined as dose to 1 ccm (D1ccm) of the structure volume. All dose values are given in Gy.