Apparatus for irradiating a patient comprises a source of a radiation beam directed along a radiation axis. The source is mounted for pivotable movement about a first horizontal axis substantially normal to the radiation axis, whereby the beam is capable of an angular scan in a vertical plane. In a preferred...http://www.google.es/patents/US4705955?utm_source=gb-gplus-sharePatente US4705955 - Radiation therapy for cancer patients
