Table 4. Dosimetric comparison for organs at risk (OARs) in two groups (mean ± SD).
| Organs at risk | HT-SBRT | X-SBRT | P value |
|---|---|---|---|
| Total lung (%) | |||
| V5 | 26.10±12.30 | 15.00±5.86 | 0.001 |
| V10 | 14.49±7.34 | 9.83±4.49 | 0.009 |
| V20 | 6.38±3.36 | 4.45±2.25 | 0.001 |
| V30 | 3.24±1.82 | 2.66±1.28 | 0.075 |
| Mean lung dose (Gy) | 4.99±2.24 | 3.81±1.76 | 0.005 |
| Max spinal cord (Gy) | 9.17±4.58 | 3.42±1.87 | 0.010 |
| Mean heart dose (Gy) | 4.52±4.46 | 2.90±2.28 | 0.584 |
SD, standard deviation; HT-SBRT, helical tomotherapy stereotactic body radiation therapy; X-SBRT, X-knife stereotactic body radiation therapy.