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Summary of the kV detection efficiencies affected by MV field size and kV SID. Two efficiencies present MV field at AP and LAT directions, respectively.
| kV SID (cm) | 181.8 | 166.7 | 150.0 | ||||
|---|---|---|---|---|---|---|---|
| MV direction | AP | LAT | AP | LAT | AP | LAT | |
| MV field size (cm2) | 10×10 | 100% | 100% | 100% | 100% | 100% | 100% |
| 15×15 | 100% | 100% | 100% | 100% | 100% | 4% | |
| 26×20 | 100% | 76% | 61% | 13% | 6% | 1% | |
