Table 3.
Dosimetric data
| Dosimetric Measure | Mean | SD | Min | Max |
|---|---|---|---|---|
| Prescription | Initial: 50-54 Gy RBE/20-25 fractions (N = 73) Cone down: 10-16 Gy RBE/4-8 fractions (N = 16) |
|||
| Max dose (Gy) | 58.5 | 4.8 | 53.3 | 79.4 |
| CTV D95% (%) | 92.6 | 7.9 | 71.8 | 102.1 |
| IMN V90% (%) | 98.5 | 3.6 | 79.6 | 100.6 |
| Lung V20 Gy (%) | 12.4 | 4.3 | 2.2 | 25.7 |
| Ipsilateral lung V20 Gy (%) | 23.9 | 6.5 | 5.8 | 35.0 |
| Heart mean dose (Gy) | 1.5 | 0.9 | 0.0 | 3.3 |
| Contralateral breast V5 Gy (%) | 0.5 | 1.6 | 0.0 | 10.9 |
Abbreviations: CTV = clinical target volume; IMN = internal mammary nodes; max = maximum; min = minimum; RBE = relative biologic effectiveness; V = volume.