| Studyref.) | Patients (n) | Scans (n) | Rate of < | ||
| AP | LR | SI | |||
| Ultrasound16) | 40 | 1019 | 61.4 | 69.3 | 59.6 |
| Fiducial seed marker16) | 40 | 1019 | 64.5 | 78.4 | 68.4 |
| CT on rails17) | 20 | 1870 | 58.0 | 78.0 | 83.0 |
| MV CBCT15) | 24 | 793 | 64.5 | 87.0 | 93.1 |
| Our study | 61 | 2302 | 91.7 | 95.1 | 86.0 |