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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.