Table 6.
MRI guidance radiotherapy systems
|
Elekta Unity MR Linac
72,76 |
ViewRay MRIdian Cobalt 60
73,77 |
ViewRay MRIdian Linac |
Australian MRI-Linac
74 |
Canadian Aurora Magnet X MR Linac 75 | |
| Magnet | 1.5 T closed | 0.35 T split bore | 0.35 T split bore | 1.0 T split bore | 0.5 T biplanar rotating geometry |
| Radiotherapy source | 7 MV | 3 Cobalt-60 heads | 6 MV | 6 MV | 6 MV |
| MLC effective leaf width at isocentre | 0.72 cm | 1.05 cm | 0.83 cm | ||
| MLC maximum leaf speed | 6 cm/sec | 2.0 ± 0.1 cm/sec | >2 cm/ sec | ||
| Magnetic field orientation to delivery | Perpendicular | Perpendicular | Perpendicular | Perpendicular and parallel | Perpendicular and parallel |
| Bore Size | 70 cm | 70 cm | 70 cm | 50 cm | 60 cm |
| Magnetic field homogeneity | ≤2.0 ppm over 50 × 50×45 cm3 | <25 ppm over 45 cm DSV | <25 ppm over 45 cm DSV | ||
| Maximum imaging field of view | 50 cm DSV | 50 cm DSV | 50 cm DSV | ||
| Maximum treatment field size | 57.4 × 22 cm2 | 27.3 × 27.3 cm2 | 27.4 × 24.1 cm2 | ||
| 4D capabilities | Yes | Yes | Yes | No | No |
| Functional imaging | Yes | Yes | Yes | No | No |
| Treating patients | Yes | Yes | Yes | No | No |
| CE Marked/ FDA approved | Yes | Yes | Yes | No | No |
DSV, diameter of spherical volume; MLC, multileaf collimator; Ppm, parts per million.