Table 1.
IMRT QA results by treatment site from 2005 to 2011.
| Treatment Service | Typical Number of Beams | Number of Plans | Mean Ion Chamber Difference (%) | 1 SD | Number of IC Failing Plans/ (% of Failing on Service) | Mean Gamma (%) | Lower 95th percentile (%) | Number of Gamma Failures/ (% of Failing on Service) |
|---|---|---|---|---|---|---|---|---|
| BRST | Varies | 67 | 0.08 | 1.61% | 2 (3.0) | 97.9 | 93.1 | 0 (0.0) |
| CNS | 5 | 1383 | −0.23 | 1.43% | 13 (0.9) | 97.9 | 92.6 | 7 (0.6) |
| GI | 6 | 803 | 0.45 | 1.80% | 33 (4.1) | 97.2 | 91.6 | 5 (0.6) |
| GU | 8 | 1831 | −0.17 | 1.18% | 11 (0.6) | 97.6 | 92.5 | 2 (0.1) |
| GYN | 9 | 935 | 0.29 | 1.61% | 23 (2.5) | 97.6 | 92.0 | 8 (0.9) |
| HEM | 5–7 | 380 | −0.16 | 1.66% | 7 (1.8) | 97.7 | 93.2 | 2 (0.5) |
| HN | 7–9 | 3697 | −0.45 | 1.62% | 76 (2.1) | 97.7 | 92.3 | 33 (0.9) |
| IMSSRT | 9 | 341 | −1.59 | 2.79% | 54 (15.8) | 97.6 | 92.9 | 4 (1.2) |
| MEL | 5–7 | 54 | −0.04 | 1.66% | 1 (1.9) | 97.2 | 92.1 | 0 (0.0) |
| MESO | 7a | 52 | 2.60 | 2.58% | 11 (21.2) | 94.4 | 86.4 | 6 (11.5) |
| PEDI | Varies | 307 | −0.25 | 2.01% | 18 (5.9) | 97.8 | 92.0 | 2 (0.7) |
| SAR | 5–7 | 201 | 0.12 | 1.50% | 6 (3.0) | 97.4 | 91.9 | 3 (1.5) |
| THOR | 8 | 2952 | −0.53 | 1.44% | 46 (1.6) | 97.8 | 92.2 | 23 (0.8) |
| Totals | N/A | 13,003 | −0.29 | 1.64% | 301 (2.3) | 97.7 | 92.2 | 95 (0.7) |
a
Although the number of beams is seven on average, each of these treatment beams may have up to three carriage positions to allow for treatment of the large fields associated with mesothelioma plans.