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Table 2 Body weight and volume changes evaluated by CT simulations (n = 40)

From: Which nasopharyngeal cancer patients need adaptive radiotherapy?

Variables 1st CT (mean ± SD) 2nd CT (mean ± SD) Change (%) p-value
Body weight (kg) 68.4 ± 13.3 64.1 ± 12.6 − 6.3 <  0.000
CTV-1 (ml) 32.2 ± 22.7 20.9 ± 18.5 −35.1 <  0.000
PTV-1 (ml) 125.8 ± 53.2 107.3 ± 43.7 − 14.7 <  0.000
Parotid-1 (ml) 23.2 ± 8.0 19.2 ± 8.0 − 17.2 < 0.000
Parotid-2 (ml) 23.0 ± 7.8 18.4 ± 8.1 − 20.0 <  0.000
  1. Abbreviations: CT computed tomography, CTV-1 clinical target volume-1, PTV-1 planning target volume of CTV-1