TABLE 7.
Measured (EBT‐XD film) virtual‐cone dose widths in the coronal plane across seven patients. The dose widths were determined from orthogonal profiles (see Figure 3) 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 | Maximum (mm) | Minimum(mm) | Mean (mm) | Mean difference with calculation (mm) |
|---|---|---|---|---|---|
|
Left‐Right (L‐R) |
50% | 5.21 ± 0.07 | 5.10 ± 0.07 | 5.15 ± 0.06 | 0.13 ± 0.06 |
| 25% | 8.66 ± 0.12 | 8.35 ± 0.12 | 8.51 ± 0.09 | 0.24 ± 0.09 | |
|
Superior‐Inferior (S‐I) |
50% | 5.18 ± 0.07 | 5.07 ± 0.07 | 5.12 ± 0.06 | −0.06 ± 0.05 |
| 25% | 8.53 ± 0.12 | 8.30 ± 0.12 | 8.43 ± 0.09 | 0.12 ± 0.09 |