Accepted: 31 March 2022
First Online: 19 April 2022
: P.J.K. is an inventor on two patents relating to MRI–linac systems: US#8,331,531 and US#9,099,271. A.C.T. receives research funding from Accuray, Elekta and Varian, and honoraria and travel assistance from Elekta. U.A.v.d.H. receives research funding from Elekta and Philips Healthcare. The other authors declare no competing interests.