Table 5.
Quality control tests for multileaf collimators (tolerances and action levels are specified in millimeters unless otherwise stated)
| Designator | Test | Performance | |
|---|---|---|---|
| Tolerance | Action | ||
| Patient‐specific | |||
| PM1 | Verification of transferred data vs. printed template | 1 | 2 |
| PM2 | Daily verification of correct data | Reproducibility | |
| PM3 | Verification of record and verify programming | Reproducibility | |
| Monthly | |||
| MM1 | Digitizer check (if used) | Functional | |
| MM2 | Light and radiation field coincidence | 1 | 2 |
| MM3 | Leaf positions for standard field template | 1 | 2 |
| MM4 | Electron field interlocks | Functional | |
| MM5 a | Leaf alignment | 1 | |
| MM6 | Records | Complete | |
| Yearly | |||
| AM1 | Leaf transmission (all energies) | Reproducibility | |
| AM2 | Leakage between leaves (all energies) | Reproducibility | |
| AM3 a | Transmission through abutting leaves | Reproducibility | |
| AM4 | Stability with gantry rotation | Reproducibility | |
| AM5 | Alignment with jaws | 1 | |
| AM6 | Independent quality control review | Complete | |
a
May not apply to all designs.