Table 2 Percentage of points passing gamma criteria of 3%/3 mm, with associated confidence limits
From: Statistical analysis of IMRT dosimetry quality assurance measurements for local delivery guideline
Treatment site | Location | Mean | Standard deviation (σ) | Maximum | Minimum |
|---|---|---|---|---|---|
Prostate | Isocenter | 99.7 | 0.5 | 100 | 92.5 |
Brain | Isocenter | 97.1 | 3.1 | 100 | 89.1 |
Head and Neck | Isocenter | 95.2 | 7.4 | 100 | 82.3 |
Overall combined | 97.3 | 3.7 | Â | Â | |
Confidence Limit = (100-mean)+1.96σ | 10.0% (i.e., 90% passing) | ||||