Table 1.
Sample variables in Virtual IMRT QA modeling (continuous variables >90)
| Number | Variable | Possible value |
|---|---|---|
| 1 | QA device | MapCHECK2, Portal dosimetry |
| 2 | Energy | 6 MV, 15 MV |
| 3 | Machine type | TrueBeam, Trilogy, 21IX, 21EX, 6EX |
| 4 | Collimator angle | Mean value averaged over all control points |
| 5 | CIAO area (i.e., 5–>5 × 5) | <5, 5–10, 10–15, 15–20, 20–25, 25–30, >30 |
| 6 | Jaw position | <5, 5–10, 10–15, 15–20, 20–25, >25 |
| 7 | Small aperture score | Fraction of MLC gaps <2, 5, 10, 20 mm |
| 8 | Fraction of area receiving at least x% of CU | 10, 20, 30, 40, 50 |
| 9 | Irregularity factor | Fraction of area outside Radius = 5, 10, 20 cm |
| 10 | MLC leaf transmission | HD, M120‐pre‐2007, M120‐post‐2007 |
| 11 | Perimeter | <10, 10–30, 30–50, 50–70, 70–90, 90–110, >110 |
| 12 | Duty cycle (Total MU/Dose) | <2, 3–3, 3–4, 4–5, 5–6, >6 |
| 13 | Modulation factor | Overall complexity (1, 2, 3) |