TABLE 4.
Measured (EBT3 film) and calculated (AAA v15.6) dose widths for a virtual cone designed to deliver 5 Gy. The dose widths were determined from orthogonal profiles (see Figure 1) that intersect the center of the dose distribution. The measured values shown below were reduced by 2% to correct for the film image and smoothing resolution
| Dose profile direction | Isodose width | Measurement (mm) | Calculation (mm) | Difference (mm) |
|---|---|---|---|---|
|
Left‐Right (L‐R) |
50% | 5.52 ± 0.08 | 5.14 | 0.38 ± 0.08 |
| 25% | 9.13 ± 0.13 | 8.39 | 0.74 ± 0.13 | |
|
Superior‐Inferior (S‐I) |
50% | 5.57 ± 0.08 | 5.18 | 0.40 ± 0.08 |
| 25% | 9.36 ± 0.13 | 8.39 | 0.97 ± 0.13 | |
|
Anterior‐Posterior (A‐P) |
50% | ‐ | 5.40 | ‐ |
| 25% | ‐ | 8.85 | ‐ |