Table 2.
Test case | TG‐53 situations | Inner (%) | Penumbra (mm) | Outer (%) | Buildup (%) | TSF (%) |
---|---|---|---|---|---|---|
1. Open square fields | Square fields | 1.5 | 2 | 2 | 20 | 0.5 |
2. Extended SSD square fields | SSD variations | 1.5 | 2 | 2 | 40 | 1 |
3. Rectangular fields | Max (rectangular, square fields) | 2 | 2 | 2 | 20 | 0.5 |
4a. Wedged square fields | Wedged | 5 | 3 | 5 | 50 | 2 |
4b. Wedged, with 45‐degree collimator | Wedged | 5 | 3 | 5 | 50 | 2 |
5. Cerrobend‐blocked b mantle field | Blocked | 3 | 2 | 5 | 50 | 1 |
6. Isocentric, cm at surface | Square fields | 1.5 | 2 | 2 | 20 | 0.5 |
7. Oblique incidence | Max (SSD variations, external surface variations) | 3 | 2 | 5 | 40 | 1 |
8. Asymmetric half‐beam | Asymmetric | 3 | 2 | 3 | 20 | 1 |
9. Oblique incidence, 45‐degree wedge | Wedged | 5 | 3 | 5 | 50 | 2 |
10. Multileaf collimator (MLC) | MLC | 3 | 3 | 5 | 20 | 1 |
The value of each tolerance was obtained from , published by the American Association of Physicists in Medicine.
Cerro Copper and Brass Company, Belfonte, PA.
total scatter factor (defined in section III.B); source‐to‐surface distance.