Table 2.
Tolerances a used in the validation of the analytical anisotropic algorithm
| 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 |
a
The value of each tolerance was obtained from , published by the American Association of Physicists in Medicine.
b
Cerro Copper and Brass Company, Belfonte, PA.
total scatter factor (defined in section III.B); source‐to‐surface distance.