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The Dose Difference Between Metropolis Calculation and Film Measurement.
| Collimator, mm2 or mm in Diameter | Dose Rate Measured With EBT3 Film, cGy/min | Dose Rate Calculated in Metropolis, cGy/min | % Difference in Dose |
|---|---|---|---|
| 10 × 10 | 240.0 | 233.0 | –2.9 |
| 20 × 20 | 273.2 | 267.5 | –2.1 |
| 40 × 40 | 309.8 | 305.6 | –1.4 |
| ϕ1 | 128.6 | 126.2 | –1.8 |
| ϕ2.5 | 173.1 | 169.2 | –2.3 |
| ϕ3.5 | 171.6 | 166.7 | –2.8 |
| ϕ5 | 216.6 | 214.6 | –0.9 |
| ϕ10 | 236.2 | 232.0 | –1.8 |
| ϕ15 | 251.2 | 247.9 | –1.3 |
| ϕ25 | 271.1 | 268.0 | –1.1 |
