title: Electron linear accelerators for radiation therapy: history, principles and contemporary developments.
mesh_terms: D001703:Biophysics / Q000266:history / Q000295:instrumentation; D003201:Computers; D055590:Electromagnetic Phenomena / Q000266:history / Q000295:instrumentation; D004583:Electrons; D049673:History, 20th Century; D008872:Microwaves; D011834:Radiation Monitoring; D011878:Radiotherapy / Q000266:history / Q000295:instrumentation; D013679:Technology, Radiologic