A radiotherapy apparatus 10 and method is claimed. The apparatus 10 comprising a treatment radiation source 20 ( which may comprise a linear accelerator), a magnetic resonance imaging (MRI) device 24 located in proximity to but outside the radiation field of the radiation source 20, and a moveable patient support 30 for supporting and translating a patient between a position in which a selected treatment area of the patient is capable of being imaged by the MRI device 24 (figure 1) and a position in which the selected treatment area is capable of receiving radiation from the radiation source 20 (figure 2). The apparatus 10 may include electromagnetic shielding for isolating the radiation source 20 and the MRI device 24.
