From: Standardized treatment planning methodology for passively scattered proton craniospinal irradiation
 |  | Cranial fields | Spinal fields | ||
---|---|---|---|---|---|
 |  |  | Upper | Middle | Lower |
Range (cm) | Min - Max | 14.7-20.60 | 8.5-15.4 | 6.6-13.6 | 7.6-16 |
 | Median | 17.0 | 10.9 | 12.3 | 11.1 |
 | SD | 1.3 | 1.9 | 2.7 | 2.2 |
Energy (MeV) | Min - Max | 180-225 | 140-200 | 140-200 | 140-200 |
 | Median | 200 | 160 | 180 | 160 |
 | SD | 12 | 17 | 18 | 17 |
SOBP (cm) | Min - Max | 15-16 | 4-7 | 4-8 | 4-7 |
 | Median | 16 | 5 | 5 | 6 |
 | SD | 1 | 1 | 2 | 1 |