Parameter | Field size (cm2) | N Clinac 2100 | N TrueBeam |
---|---|---|---|
PDD at dmax | 10 ×10 | 116 | 11 |
PDD at 5, 15, and 20 cm | 6 ×6 | 99 | 11 |
10 ×10 | 116 | 11 | |
20 ×20 | 99 | 11 | |
Off-axis ratios at 5 cm left, | 40 ×40 | 116 | 11 |
10 cm avg., | |||
and 15 cm left | |||
Open field OF at dmax | 6 ×6 | 104 | 11 |
15 ×15 | |||
20 ×20 | |||
30 ×30 | |||
IMRT-style OF at 10 cm | 2 ×2 | 4 | 11 |
3 ×3 | |||
4 ×4 | |||
6 ×6 | |||
SBRT-style OF at 10 cm | 2 ×2 | 20 | 4 |
3 ×3 | |||
4 ×4 | |||
6 ×6 |