Table 1 Scoring total QA, gamma passing rate, and point dose error of pretreatment QA
Total QA score | ||
|---|---|---|
Max (Gamma passing rate score, Point dose error score) | ||
Gamma passing rate score | Point dose error score | |
Pass | ||
Grade 1 | 98% ≤ PR | AD ≤ 1% |
Grade 2 | 95% ≤ PR < 98% | 1% < AD ≤ 2.5% |
Grade 3 | 90% ≤ PR < 95% | 2.5% < AD ≤ 5% |
Failure | ||
Grade 4 | PR < 90% | 5% < AD |