. 2017 Dec;6(6):689–707. doi: 10.21037/tlcr.2017.09.02

Table 4. Characteristics of the most widely used MRI-guided radiotherapy treatment machines. Magnet strength (B₀) is reported with reference to the direction of the treatment beam (78).

Treatment machine	Treatment beam(s)	Bore size (cm) (79)	B₀ Tesla (T)	Orientation of beam	Magnet design
Elekta MR-Linac (80)	7 MV Linac	70	1.5	Perpendicular	Closed
Canadian Linac MR (81)	6 or 10 MV Linac	85 open bore	0.5^†	Inline	Split
Australian MRI-Linac (82)	4 or 6 MV Linac	82 open bore	1.0^‡	Inline or perpendicular	Split
ViewRay MRIdian (83)	Three ⁶⁰Co sources	70	0.35	Perpendicular	Split

^†, early version had B₀ 0.2 T (84); ^‡, B₀ 1.5 T currently under investigation. MRI, magnetic resonance imaging; MV, mega-voltage.

Table 4. Characteristics of the most widely used MRI-guided radiotherapy treatment machines. Magnet strength (B0) is reported with reference to the direction of the treatment beam (78).