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Central axis surface dose for various tested field sizes.
| Field Size | Halcyon (6 MV FFF) | TrueBeam (6 MV) | % Difference |
|---|---|---|---|
| 5 × 5 cm | 42.68 cGy | 32.27 cGy | 32.2% |
| 10 × 10 cm | 51.32 cGy | 38.03 cGy | 34.9% |
| 20 × 20 cm | 57.03 cGy | 46.95 cGy | 21.5% |
| 28 × 28 cm | 60.99 cGy | 55.09 cGy | 10.7% |
