General diagram of an accelerator

1: Production and acceleration of electrons. 2: Deviation of the electron beam at 270° in order to bring it into line with the patient. 3: Target and diffusing primary filter. 4: First collimator. 5: Main diffusing filter. 6: Ionising room for electrons (when only electrons are used). 7: Multileaf collimator. 8: Electron applicator and calibrated beam.