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Table 3 Relative dose parameters of selected organs at risk for different cranial PTVs of rectal cancer

From: Dosimetric analysis and comparison of reduced longitudinal cranial margins of VMAT-IMRT of rectal cancer

Structure Parameter PTV0 PTV-1 p-value PTV-2 p-value PTV-3 p-value
  Volume (%)
Bone V10 87 84 0.007 78 0.005 70 0.005
V20 69 66 0.005 62 0.005 55 0.005
V30 44 41 0.007 39 0.005 33 0.005
V40 29 27 0.017 24 0.007 20 0.005
Darm loops V10 21 18 0.008 14 0.008 10 0.008
V15 19 16 0.008 13 0.008 8 0.008
V20 14 11 0.008 09 0.008 06 0.008
V25 9 7 0.008 5 0.008 4 0.008
V30 6 5 0.008 3 0.008 3 0.008
V35 4 3 0.028 2 0.028 2 0.018
V40 3 2 0.043 2 0.028 1 0.028
V45 2 2 0.018 2 0.028 1 0.028
V50 1 0 0.612 0 0.176 0 0.028
Peritoneal space V10 71 58 0.005 47 0.005 37 0.008
V15 61 51 0.005 42 0.005 33 0.005
V20 48 42 0.005 34 0.005 28 0.005
V25 36 32 0.005 27 0.005 22 0.005
V30 27 24 0.005 21 0.005 18 0.005
V35 22 20 0.005 17 0.005 15 0.005
V40 18 17 0.005 15 0.005 13 0.005
V45 16 15 0.005 13 0.005 12 0.005
V50 08 07 0.114 06 0.005 06 0.005
  1. Bold values: statistic significant versus PTV0. PTV-1 = PTV minus 1 cm on cranial site. p-value = PTV1,2,3 vs. PTV0