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Table 3 Detailed dosimetric comparison between replanning based on the initial CT with propagated contours from the repeat CT and replanning based on the repeat CT

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

  Initial CT Repeat CT Sig (p)
PTVGTV Dmax 1343.5 ± 65.9 1335.2 ± 29.7 0.66
PTVGTV Dmean 1253.5 ± 40.3 1244.4 ± 13.7 0.42
PTVGTV V93 96.9 ± 3.0 97.2 ± 2.6 0.79
PTVGTV V95 91.8 ± 7.2 93.0 ± 5.4 0.66
PTVCTV Dmax 1349.4 ± 61.3 1338.2 ± 29.0 0.55
PTVCTV Dmean 1083.4 ± 31.5 1078.3 ± 23.7 0.67
PTVCTV V93 98.9 ± 1.1 99.1 ± 0.9 0.12
PTVCTV V95 98.4 ± 1.3 98.7 ± 1.2 0.24
Brainstem Dmax 859.7 ± 89.1 852.8 ± 89.7 0.5
Brainstem Dmean 457.2 ± 92.3 436.9 ± 110.5 0.15
Cord Dmax 692.0 ± 29.8 690.6 ± 31.3 0.9
Cord Dmean 413.3 ± 64.2 418.7 ± 63.5 0.17
Mandible Dmax 1146.9 ± 99.5 1131.6 ± 84.5 0.38
Mandible Dmean 691.7 ± 70.2 689.8 ± 60.5 0.24
Lt parotid Dmax 1134.0 ± 143.2 1139.1 ± 103.6 0.97
Lt parotid Dmean 519.4 ± 61.3 513.2 ± 57.2 0.17
Lt parotid V5 42.1 ± 8.5 41.8 ± 7.8 0.6
Rt parotid Dmax 1144.0 ± 95.8 1162.1 ± 107.3 0.21
Rt parotid Dmean 514.9 ± 32.8 511.8 ± 40.8 0.63
Rt parotid V5 39.5 ± 4.0 39.3 ± 4.8 0.82
  1. Note: the unit for dose is cGy; V5 = the volume receiving 5 Gy.