TABLE 2.
Volume size comparison of free breathing and DIBH in VMAT‐plans
| FB | DIBH | |||||
|---|---|---|---|---|---|---|
| Parameter | Median | Range | Median | Range | Number of volumes | p‐value |
| Target | ||||||
| PTV (cm3) | 32.28 | 13.64–72.89 | 23.46 | 9.06–61.52 | 16 | <0.01 |
| Conformity index | 0.89 | 0.85–0.92 | 0.88 | 0.85–0.91 | 13 | <0.01 |
| OAR | ||||||
| Lungs (cm3) | 4282.64 | 2331.17–7656.70 | 6087.40 | 4451.55–9911.26 | 13 | <0.01 |
| Lungs‐GTV V20Gy (%) | 3.70 | 0.47–6.70 | 2.17 | 0.45–15.87 | 13 | 0.02 |
| Chest wall V30Gy (cm3) | 12.71 | 2.17–56.91 | 10.06 | 0.15–29.32 | 14 | 0.01 |
Abbreviations: DIBH, deep inspiration breath‐hold; FB, free breathing; GTV, gross tumor volume; OAR, organs at risk; PTV, planning target volume; V20Gy, organ volume receiving > 20 Gy; V30Gy, organ volume receiving > 30 Gy.; VMAT, volumetric‐modulated arc therapy.