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Summary of commercially available EPID units used in this study.
| Model type | Active area (pixels) |
Spatial resolution (mm/pixel) |
|---|---|---|
| Varian aS500 | 512 × 384 | 0.784 |
| Varian aS1000 | 1024 × 768 | 0.392 |
| Siemens OptiVue 500 | 512 × 512 | 0.4 |
| Siemens OptiVue 1000 | 1024 × 1024 | 0.4 |
