Table 2.
Parameters of organs at risk (OAR) and planning target volume (PTV).
| OAR and PTV volume parameter | Case 1 | Case 2 | Case 3 |
|---|---|---|---|
| Heart D15 ml (Gy) | 46.3 | 42.4 | 42.9 |
| Heart D0,035 ml (Gy) | 61.0 | 51.3 | 50.0 |
| Heart Dmean (Gy) | 4.8 | 13.5 | 14.5 |
| Lung Left Dmean (Gy) | 1.8 | 7.7 | 2.1 |
| Esophagus D5 ml (Gy) | 5.9 | 4.9 | 13.3 |
| Esophagus D0,035 ml (Gy) | 8.6 | 7.1 | 21.9 |
| Stomach D10 ml (Gy) | 10.4 | 7.3 | 6.5 |
| Stomach D5 ml (Gy) | 12.2 | 8.0 | 8.7 |
| Stomach D0,035 ml (Gy) | 18.3 | 11.6 | 14.3 |
| PTV (mL) | 21.2 | 23.4 | 43.4 |
| PTVredo (mL) | 18.3 | 62.2 | 20.0 |
| PTVxPTVredo (mL) | 11.3 | 0.1 | 0.4 |
| PTVxPTVredo (%) | 61.7 | 0.2 | 2.2 |
| PTVxPTVredo Dmax (Gy) | 32.1 | 25.6 | 25.8 |
| PTVxPTVredo D0,035 ml(Gy) | 31.9 | 24.5 | 25.6 |
| PTVxPTVredo Dmean (Gy) | 28.8 | 24 | 25.2 |
Dose-volume parameters are based on integrated isodose plans calculation from the first and second SBRT sessions. Both CT series from simulation were registered according to the heart region and summation of dose distribution was performed. D—abbreviation for dose; D5 ml, D10 ml, and D15 ml represents the dose to 5, 10, and 15 ml of relevant OAR, respectively. D.035 ml represents near-maximum dose, “x” means the intersection of volumes, redo means second irradiation.