Table 3.
Comparison of average dose parameters and volumes from the FB and DIBH treatment plans
| FB | DIBH | |
|---|---|---|
| CTV | ||
| Dmean (Gy) | 50.0 ± 0.0 | 50.0 ± 0.0 |
| D98% (Gy) | 47.0 ± 0.5 | 47.0 ± 0.5 |
| V95% (%) | 96.9 ± 1.1 | 96.9 ± 0.8 |
| Volume (ml) | 756.0 ± 400.7 | 759.4 ± 404.6 |
| PTV | ||
| Dmedian (Gy) | 49.8 ± 0.1 | 49.8 ± 0.1 |
| D98% (Gy) | 43.9 ± 3.6 | 45.8 ± 0.8 |
| V95% (%) | 92.2 ± 2.1 | 92.4 ± 2.1 |
| Volume (ml) | 956.3 ± 455.5 | 972.1 ± 467.4 |
| Heart | ||
| Dmean (Gy) | 3.0 ± 1.0 | 2.0 ± 0.9a |
| V25 Gy (%) | 3.3 ± 1.7 | 1.0 ± 1.3a |
| Volume (ml) | 625.7 ± 109.7 | 595.5 ± 87.8 |
| LAD | ||
| Dmean (Gy) | 28.1 ± 13.3 | 13.0 ± 11.4a |
| D2% (Gy) | 43.7 ± 11.4 | 29.0 ± 17.2a |
| V20 Gy (%) | 63.7 ± 30.0 | 24.4 ± 25.3a |
| Left lung | ||
| V20 Gy (%) | 13.5 ± 2.5 | 13.3 ± 1.8 |
| Volume (ml) | 1283.1 ± 298.8 | 2098.2 ± 250.2a |
a
Statistically significantly (P<0.05) different compared with FB.
FB, free‐breathing; DIBH, deep inspiration breath hold; CTV, clinical target volume; PTV, planning target volume; LAD, left ascending coronary artery; D98%, dose to 98% of target volume; V95%, volume of target receiving 95% of prescribed dose; V20/25 Gy, volume of organ receiving 20/25 Gy; D2%, maximum dose given to 2% of volume.