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Table 4 Dosimetric comparisons of without replanning in the initial CT, replanning in the initial CT

From: A modified VMAT adaptive radiotherapy for nasopharyngeal cancer patients based on CT-CT image fusion

  Without replannng in iCT Replanning in iCT Sig (p)
PTVGTV Dmax 1332.6 ± 42.4 1343.5 ± 65.9 0.77
PTVGTV Dmean 1257.2 ± 30.1 1253.5 ± 40.3 0.97
PTVGTV V93 98.2 ± 1.7 96.9 ± 3.0 0.12
PTVGTV V95 94.8 ± 4.7 91.8 ± 7.2 0.26
PTVCTV Dmax 1341.8 ± 40.7 1349.4 ± 61.3 0.85
PTVCTV Dmean 1087.2 ± 20.7 1083.4 ± 31.5 0.91
PTVCTV V93 99.2 ± 0.7 98.9 ± 1.1 0.27
PTVCTV V95 98.8 ± 0.9 98.4 ± 1.3 0.62
Brainstem Dmax 844.7 ± 95.4 859.7 ± 89.1 0.94
Brainstem Dmean 448.5 ± 76.4 457.2 ± 92.3 0.84
Cord Dmax 695.5 ± 44.2 692.0 ± 29.8 0.87
Cord Dmean 409.0 ± 54.7 413.3 ± 64.2 0.82
Mandible Dmax 1128.2 ± 95.0 1146.9 ± 99.5 0.76
Mandible Dmean 705.4 ± 70.9 691.7 ± 70.2 0.91
Lt parotid Dmax 1138.7 ± 114.6 1134.0 ± 143.2 0.99
Lt parotid Dmean 581.9 ± 87.1 519.4 ± 61.3 0.05
Lt parotid V5 49.9 ± 12.3 42.1 ± 8.5 0.01
Rt parotid Dmax 1151.8 ± 108.1 1144.0 ± 95.8 0.75
Rt parotid Dmean 581.2 ± 79.8 514.9 ± 32.8 0.02
Rt parotid V5 50.7 ± 8.3 39.5 ± 4.0 0.001
  1. Note: the unit for dose is cGy, V5 = the volume receiving 5 Gy.