TABLE 1.
Comprehensive pre‐treatment QA tolerances for proton PBS FLASH radiotherapy.
| Quality assurance items | Tolerances |
|---|---|
| Safety checks | |
| Door warning | Functional |
| Intercom | Functional |
| Search button | Functional |
| Beam pause | Functional |
| Beam on indicator | Functional |
| Laser checks | |
| Laser Sup‐Inf | ±2 mm |
| Laser Lt‐Rt | ±2 mm |
| Laser Ant‐Post | ±2 mm |
| Beam quality checks | |
| Absolute dosimetry | |
| Output constancy (same day) | ±2% / ± 5% a |
| Output constancy (day‐to‐day) | ±3% / ± 10% a |
| Relative dosimetry | |
| Field symmetry | ±1% b |
| Field flatness | ±2% b |
| Field lateral penumbra | ±2 mm b |
| Spot position | ±1 mm b |
| Spot size | ±10% b |
| Range verification | ±1 mm b |
| Temporal dosimetry | |
| Field dose rate (same day) | ±2%/±5% a |
| Field dose rate (day‐to‐day) | ±3%/±10% a |
| Scanning speed | ±1 mm/ms |
| Spot dwell time | ±0.2 ms |
| Spot transition time | ±0.2 ms |
a
Proposed tolerance for (non‐saturated monitor chamber/saturated monitor chamber) under ultra‐high dose rate delivery.
b
Compliance with TG‐224.