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 |