Table 2.
Summary of the geometry parameters used for the six participating sites. The QA dose plane parameters were the ones used for both a) actual MapCHECK measurements (for comparisons/commissioning), and b) simulated dose planes resulting from a conversion of the EPID images.
| Site / EPID Vendor | Source‐to‐EPID Distance (cm) | Source‐to‐QA Dose Plane (cm) | QA Dose Plane Depth (cm) |
|---|---|---|---|
| A / Varian | 140.0 | 100.0 | 5.0 |
| B / Varian | 100.0 | 100.0 | 10.0 |
| C / Siemens | 100.0 | 100.0 | 5.0 |
| D / Varian | 120.0 | 100.0 | 5.0 |
| E / Varian | 105.0 | 95.0 | 5.0 |
| F / Varian | 105.0 | 100.0 | 5.0 |