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Table 2 Summary of dosimetric results for PTV

From: Chest wall desmoid tumours treated with definitive radiotherapy: a plan comparison of 3D conformal radiotherapy, intensity-modulated radiotherapy and volumetric-modulated arc radiotherapy

Parameter 3DCRT IMRT VMAT P value
3DCRT vs IMRT 3DCRT vs VMAT IMRT vs VMAT
Minimum (Gy) 40.0 ± 8.8 32.5 ± 11.2 30.57 ± 13.5 0.028 0.037 0.508
Maximum (Gy) 63.8 ± 3.0 67.5 ± 8.9 63.9 ± 2.9 0.203 0.959 0.333
Mean (Gy) 58.2 ± 1.9 57.5 ± 2.0 57.1 ± 1.4 0.092 0.074 0.878
D5%(Gy) 61.6 ± 2.2 60.5 ± 3.0 60.3 ± 2.5 0.169 0.037 0.859
D95%(Gy) 55.3 ± 2.8 53.3 ± 2.8 50.0 ± 8.6 0.203 0.053 0.114
HI (D5 % -D95 % ; Gy) 6.27 ± 2.76 7.20 ± 4.60 10.25 ± 10.42 0.575 0.386 0.139
V95 % (%) 95.5 ± 3.2 92.2 ± 7.2 92.5 ± 5.6 0.333 0.139 0.799
CI 1.35 ± 0.2 1.03 ± 0.13 0.98 ± 0.14 0.005 0.005 0.445
MU 313 ± 112 1427 ± 532 570 ± 285 0.005 0.432 0.005
Beam on time (second) 206 ± 122 302 ± 86 366 ± 164 0.056 0.005 0.231
  1. CI Conformity index, defined as the ratio between the volume receiving at least 95 % of the prescribed dose and the volume of the PTV, HI Homogeneity index, defined as difference between the dose covering 5 % and dose covering 95 % of the PTV. P value determined using Wilcoxon matched pair rank sum test in SPSS