Table 2 Average volume changes from the planning CT to the CBCTs
Volume (cm3) | GTV | CTV | Brainstem | Cord | Right parotid | Left parotid |
|---|---|---|---|---|---|---|
Planning CT | 67.1 ± 58.7 | 577.0 ± 137.5 | 27.7 ± 2.3 | 13.6 ± 4.7 | 26.7 ± 6.3 | 25.7 ± 7.3 |
CBCT 1 | 66.4 ± 59.2 | 512.3 ± 130.9 | 27.5 ± 2.4 | 12.5 ± 2.2 | 24.9 ± 6.9 | 24.1 ± 6.6 |
CBCT 2 | 66.5 ± 58.6 | 525.2 ± 138.7 | 28.5 ± 3.7 | 13.6 ± 5.0 | 24.0 ± 5.8 | 23.3 ± 6.8 |
CBCT 3 | 66.0 ± 57.5 | 520.6 ± 141.7 | 27.4 ± 2.3 | 12.9 ± 3.3 | 23.3 ± 5.9 | 22.2 ± 7.1 |
CBCT 4 | 64.4 ± 57.0 | 500.9 ± 125.0 | 26.9 ± 2.3 | 12.6 ± 2.2 | 22.3 ± 5.7 | 20.9 ± 6.3 |
CBCT 5 | 65.9 ± 57.8 | 506.6 ± 137.5 | 26.8 ± 3.5 | 13.8 ± 3.6 | 20.5 ± 4.9 | 19.6 ± 6.2 |