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Proton therapy system delivery regimes. A requested delivery field is categorized in range and field size regimes. Within a regime set the scan pattern and range modulator weights are nominally fixed.
| Maximum field diameter (cm) | Range in water | ||
|---|---|---|---|
| Up to 12 cm | 12–20 cm | 20–27 cm | |
| Up to 12 | X | X | X |
| 12–20 | X | X | X |
| 20–30 | X | X | Not used |
