TABLE 3.
Percentage difference in calculated MUs, with and without OF table extension. Patient specific point dose measured data are included for the 6FFF fields
| Energy | Jaw size (cm) | # of arcs | Average % difference in MU | Max % difference in MU | Average % difference, measured versus calculated (no OFT extension) | Max % difference, measured versus calculated (no OFT extension) |
|---|---|---|---|---|---|---|
| 6 FFF | 0.7–0.9 | 9 | 6.13% ± 0.01% | 6.14% | 8.47% ± 1.7% | 10.68% |
| 1.0 | 5 | 6.13% ± 0.01% | 6.14% | 5.24% ± 1.24% | 6.84% | |
| 1.0–1.1 | 7 | 5.86% ± 0.15% | 5.99% | 4.97% ± 1.56% | 6.53% | |
| 1.1–1.2 | 5 | 5.41% ± 0.10% | 5.83% | 4.32% ± 1.47% | 6.69% | |
| 1.2–1.4 | 4 | 4.92% ± 0.22% | 5.26% | 3.46% ± 0.9% | 3.85% | |
| 1.4–1.6 | 4 | 4.12% ± 0.26% | 4.50% | 2.94% ± 0.51% | 3.24% | |
| 6 MV | 0.7–1.0 | 11 | 7.55% ± 0.06% | 7.57% | ||
| 1.1–1.2 | 2 | 6.97% ± 0.32% | 7.19% | |||
| 1.2–1.4 | 3 | 5.83% ± 0.17% | 5.96% | |||
| 1.4–1.7 | 3 | 5.07% ± 0.13% | 5.17% | |||
| 1.7–1.8 | 2 | 4.53% ± 0.01% | 4.53% | |||
| 1.9–2.2 | 8 | 2.98% ± 0.12% | 3.03% |
Rx and 3D isodose distribution were kept identical between plans calculated with and without OF Table extension.