Table 3.
Comparison EBT3 measured and calculated surface doses for no bolus, gel, and brass bolus (in chest wall phantom)
| Bolus type (thickness) | Film position | TPS calculated surface dose (%) | Mean±SD (%) | EBT3 mean surface dose (%) | Mean±SD (%) | P |
|---|---|---|---|---|---|---|
| No bolus (0.0 cm) | 1 | 54.8 | 58.2±8.5 | 51.3 | 52.7±7.9 | 0.15 |
| 2 | 70.9 | 63.7 | ||||
| 3 | 53.3 | 50.7 | ||||
| 4 | 53.8 | 44.9 | ||||
| Superflab gel (0.5 cm) | 1 | 98.7 | 98.4±4.8 | 102.4 | 103.1±4.6 | 0.25 |
| 2 | 104.8 | 109.6 | ||||
| 3 | 97.0 | 102.0 | ||||
| 4 | 93.3 | 98.5 | ||||
| Single layer brass mesh (0.12 cm) | 1 | 81.3 | 80.7±6.1 | 86.3 | 88.9±6.5 | 0.08 |
| 2 | 89.0 | 97.5 | ||||
| 3 | 77.6 | 89.4 | ||||
| 4 | 75.0 | 82.2 |
SD: Standard deviation, TPS: Treatment planning system