Some implementations provide a method that includes: placing a human subject on a moveable platform located in a room with a magnetic resonance imaging (MRI) scanner and a radiation therapy machine； moving the platform into a first position such that the human subject is positioned to be imaged by MRI； operating the MRI scanner while the platform is in the first position to obtain an image of the human subject； moving the platform into a second position such that the human subject is in position to receive radiation therapy from the radiation therapy machine； reducing the magnetic field such that the magnetic field at the radiation therapy machine is below a threshold value； and while the platform is in the second position and the magnetic field at the radiation therapy machine is below the threshold value, operating the radiation therapy machine to perform radiation therapy on the human subject.
