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Table 2 Volume changes between the initial planning CT (iCT) and the repeat CT (rCT) at 23rd fraction

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

Unit(cm3) Volumes in iCT Volumes in rCT Sig (p)
GTV 78.83 ± 38.42 71.44 ± 37.46 0.42
Brainstem 28.77 ± 2.89 26.43 ± 3.03 0.22
Cord 25.52 ± 2.44 24.57 ± 2.30 0.44
Mandible 89.49 ± 14.33 89.23 ± 12.32 0.58
Left parotid 19.91 ± 4.89 11.80 ± 2.79 <0.01
Right Parotid 21.58 ± 6.16 13.29 ± 4.17 <0.01