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Comparisons of measured head scatter factor with that of TG-74 published data at 10 cm water equivalent depth in mini phantoms.
| Field size (cm2) | 6MV-FB Siemens (Primus) | TG-74 | % of deviation | 6MV-FB Varian (Clinac iX) | TG-74 | % of deviation |
|---|---|---|---|---|---|---|
| 5 | 0.9614 | 0.9610 | 0.04 | 0.9642 | 0.9680 | −0.40 |
| 10 | 1.0000 | 1.0000 | 0.00 | 1.0000 | 1.0000 | 0.00 |
| 15 | 1.0175 | 1.0170 | 0.05 | 1.0154 | 1.0160 | −0.06 |
| 20 | 1.0253 | 1.0270 | −0.17 | 1.0245 | 1.0260 | −0.15 |
| 30 | 1.0317 | 1.0320 | −0.03 | 1.0372 | 1.0410 | −0.37 |
| 40 | 1.0326 | 1.0320 | 0.06 | 1.0476 | 1.0510 | −0.32 |
