TABLE 2.
Comparison parameters of normal tissue with VMAT or IMRT (mean ± SD)
| Structure | Parameters | IMRT | VMAT | VMAT/IMRT | p value | |
|---|---|---|---|---|---|---|
| Heart | Mean dose | (Gy) | 14.0 ± 5.3 | 13.5 ± 5.0 | 0.97 ± 0.05 | 0.792 |
| V30 | (%) | 10.6 ± 5.8 | 9.9 ± 5.9 | 0.91 ± 0.30 | 0.251 | |
| V10 | (%) | 55.7 ± 29.6 | 50.2 ± 29.0 | 0.89 ± 0.12 | 0.611 | |
| V5 | (%) | 77.0 ± 21.1 | 78.0 ± 20.1 | 1.02 ± 0.06 | 0.355 | |
| Left Lung | Mean dose | (Gy) | 14.1 ± 2.3 | 12.8 ± 1.9 | 0.91 ± 0.05 | 0.001 |
| V20 | (%) | 24.2 ± 5.9 | 21.0 ± 3.8 | 0.89 ± 0.09 | 0.002 | |
| V10 | (%) | 42.4 ± 11.9 | 37.1 ± 8.4 | 0.89 ± 0.09 | 0.001 | |
| V5 | (%) | 66.0 ± 15.5 | 61.1 ± 18.0 | 0.92 ± 0.07 | 0.001 | |
| Right Lung | Mean dose | (Gy) | 4.67 ± 0.93 | 4.49 ± 1.06 | 0.94 ± 0.14 | 0.409 |
| V5 | (%) | 41.2 ± 12.3 | 32.1 ± 18.2 | 0.71 ± 0.31 | 0.034 | |
| Right Breast | Mean dose | (Gy) | 2.3 ± 1.6 | 1.7 ± 1.2 | 0.70 ± 0.04 | 0.002 |
IMRT = intensity-modulated radiotherapy; SD = standard deviation; V20 = the percentage of the lung volume which receives radiation doses of 30 Gy; VMAT = volumetric modulated arc therapy