. Author manuscript; available in PMC: 2022 Apr 6.

Published in final edited form as: CA Cancer J Clin. 2021 Nov 18;72(1):34–56. doi: 10.3322/caac.21707

TABLE 2.

Currently Approved Devices and Features

COMMERCIAL NAME (REFERENCE)	MANUFACTURE	MRI FIELD STRENGTH	BORE DIAMETER	BEAM STRENGTH	NO. OF DEVICES OPERATIONAL GLOBALLY
Commercially available
ViewRay (Mutic & Dempsey 2014⁵⁸)	ViewRay Technologies Inc (Oakwood, Ohio)	0.35 Tesla	70 cm		41
• Co-60				Co-60 source
• Linac				6 MV
Elekta Unity (Raaymakers 2009,⁶¹ 2017⁶²)	Elekta AB (Stockholm, Sweden)	1.5 Tesla	70 cm	7 MV	26
In development
Australian MRI linac system (Keall 2014⁵⁶)	Australian MRI-linac program	1 Tesla	82 cm	6 MV	NA
Aurora-RT System (Fallone 2014⁶³)	MagnetTx (Edmonton, Alberta, Canada)	0.5 Tesla	60 cm	6 MV	NA

Abbreviations: Co-60, cobalt-60; linac, linear accelerator; MRI, magnetic resonance imaging; MV, megavolts; NA, not applicable; RT, radiotherapy.