Table 1.
Plan quality metrics comparing 60Co‐compensators plans to baseline clinical 6 MV‐MLC plans. Five head‐and‐neck plans (top panel) and five gynecological plans (bottom panel) were generated for a 6 MV‐MLC, a 60Co‐compensator device with a 63‐cm SCD, and a 60Co compensator device with 53‐cm SCD. All compensator plans used 2 mm compensator resolution, 2 TVL maximum thickness, and 9 beams. Values shown indicate the percent deviation of the 60Co‐compensator plans from the 6 MV‐MLC plan ± one standard deviation
| Difference from 6 MV‐linac plan | ||
|---|---|---|
| 63 cm SCD | 53 cm SCD | |
| Head and neck endpoint | ||
| PTV D2% | +0.5 ± 1.7% | +1.5 ± 1.5% |
| PTV D99% | +2.0 ± 5.4 | −0.7 ± 6.3 |
| L parotid mean dose | +8.6 ± 8.9 | +14.0 ± 9.2 |
| R parotid mean dose | +7.4 ± 12.2 | +11.1 ± 15.1 |
| Cord max dose | +0.9 ± 6.9 | +0.9 ± 5.6 |
| Gynecological endpoint | ||
| PTV D2% | −0.8 ± 0.7% | −0.4 ± 0.8% |
| PTV D99% | +2.1 ± 3.0 | −0.9 ± 0.9 |
| Rectum D60% | +7.0 ± 13.1 | +7.1 ± 12.4 |
| Bladder D35% | +0.2 ± 1.2 | +0.2 ± 2.0 |