Table 3 Dosimetry differences between ART and phantom non-ART plans in various target volumes and organs at risk (n = 40)
From: Which nasopharyngeal cancer patients need adaptive radiotherapy?
Variables | ART* (Gy; mean ± SD) | Phantom plan (Gy; mean ± SD) | Change (%) | p-value |
|---|---|---|---|---|
PTV-1, D98 | 15.4 ± 1.6 | 12.3 ± 3.7 | 20.1 | <  0.000 |
PTV-1, D95 | 15.6 ± 1.6 | 13.8 ± 3.2 | 13.0 | 0.001 |
PTV-1, D50 | 16.0 ± 1.7 | 15.9 ± 1.6 | 0.6 | 0.071 |
Brainstem, D2 | 6.6 ± 1.8 | 6.6 ± 1.7 | −0.0 | 0.990 |
Cord, Dmax | 6.0 ± 1.3 | 6.4 ± 1.4 | −6.3 | 0.243 |
Chiasm, Dmax | 1.8 ± 2.0 | 2.1 ± 2.8 | −16.5 | 0.241 |
Chiasm, Dmean | 1.3 ± 1.3 | 1.5 ± 2.2 | −13.3 | 0.285 |
Optic N, Dmax | 2.3 ± 2.9 | 2.6 ± 3.5 | −13.0 | 0.390 |
Optic N, Dmean | 1.0 ± 0.8 | 1.2 ± 1.2 | −20.0 | 0.282 |
Cochlear, Dmax | 8.3 ± 2.8 | 8.6 ± 2.7 | −3.6 | 0.501 |
Cochlear, Dmean | 6.1 ± 2.0 | 6.0 ± 2.0 | 1.7 | 0.899 |
Parotid-1, Dmean | 5.3 ± 1.6 | 6.0 ± 2.3 | −11.7 | 0.004 |
Parotid-2, Dmean | 4.2 ± 1.3 | 4.3 ± 1.4 | −2.3 | 0.617 |