Table 2.
Comparison of intensity maps of physical and enhanced dynamic wedges for 10 cm × 10 cm field size at the depth of dmax, 10 cm and 20 cm for 6 and 18 MV photons.
Wedge angle | DD |
DTA |
γ ≤ 1 |
DD |
DTA |
γ ≤ 1 |
DD |
DTA |
γ ≤ 1 |
---|---|---|---|---|---|---|---|---|---|
dmax | 10 cm | 20 cm | |||||||
6 MV photons | |||||||||
15° | 2% | 2 mm | 100% | 2% | 2 mm | 100% | 2% | 2 mm | 100% |
30° | 3% | 2 mm | 100% | 2% | 2 mm | 100% | 3% | 3 mm | 100% |
45° | 3% | 3 mm | 98% | 3% | 3 mm | 98% | 3% | 3 mm | 97.4% |
60° | 3% | 3 mm | 96.6% | 3% | 3 mm | 96.7% | 3% | 3 mm | 100% |
18 MV photons | |||||||||
15° | 2% | 2 mm | 100% | 2% | 2 mm | 100% | 2% | 2 mm | 100% |
30° | 2% | 2 mm | 100% | 2% | 2 mm | 100% | 2% | 2 mm | 100% |
45° | 2% | 2 mm | 100% | 2% | 2 mm | 100% | 2% | 2 mm | 100% |
60° | 3% | 3 mm | 97.6% | 3% | 3 mm | 97.2% | 3% | 3 mm | 100% |
DD: delta dose, DTA: distance to agreement, γ ≤ 1: gamma pixel match.