Table 1.
Treatment technique for all fields in the proton craniospinal irradiations. ‘Air gap’ refers to the distance between the downstream face of the range compensator and the proximal surface of the patient.
| Boy | LPA | UPA | RPO | LPO | LPOB | LLB | |
|---|---|---|---|---|---|---|---|
| Pre-nozzle proton energy (MeV) | 140 | 140 | 180 | 180 | 160 | 140 | |
| Range in patient (cm H2O) | 9.4 | 8.9 | 16.0 | 15.9 | 11.3 | 9.2 | |
| SOBP width (cm) | 7 | 7 | 16 | 16 | 7 | 6 | |
| Gantry angle | 180° | 180° | 255° | 105° | 130° | 90° | |
| Air gap (cm) | 10 | 10 | 2 | 2 | 2 | 2 | |
| Aperture thickness (cm) | 4 | 4 | 6 | 6 | 4 | 4 | |
| Collimated field, major axis (cm) | 18.4 | 19.2 | 19.3 | 19.8 | 11.8 | 11.6 | |
| Collimated field, minor axis (cm) | 6.8 | 6.6 | 14.3 | 15.0 | 5.5 | 5.4 | |
| Girl | LPA | UPA | RPO | LPO | LPOB | PAB | RPOB |
| Pre-nozzle proton energy (MeV) | 160 | 160 | 200 | 200 | 160 | 180 | 160 |
| Range in patient (cm H2O) | 11.6 | 11.7 | 16.5 | 16.8 | 12.0 | 13.5 | 12.0 |
| SOBP width (cm) | 7 | 6 | 16 | 16 | 8 | 8 | 8 |
| Gantry angle | 180° | 180° | 255° | 105° | 97° | 180° | 263° |
| Air gap (cm) | 24 | 24 | 23 | 21 | 23 | 29 | 23 |
| Aperture thickness (cm) | 4 | 4 | 6 | 6 | 4 | 6 | 4 |
| Collimated field, major axis (cm) | 19.8 | 15.7 | 15.9 | 15.9 | 6.6 | 7.0 | 6.3 |
| Collimated field, minor axis (cm) | 5.0 | 4.8 | 15.2 | 15.2 | 6.3 | 6.3 | 6.3 |
Abbreviations: LPA = lower posterior anterior; UPA = upper posterior anterior; RPO = right posterior oblique; LPO = left posterior oblique; LPOB = left posterior oblique boost; LLB = left lateral boost; PAB = posterior anterior boost; RPOB = right posterior oblique boost; SOBP = spread-out Bragg peak.