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The lecture is given by the Head of the Radiation Therapy Department of Medscan.rf S.V. Usychkin. Remote ("External") radiation therapy. Varian TrueBeam linear accelerator. How the accelerator generates radiation. Inventors of the klystron. The radiation beam generation system. Multileaf collimator (MLC). How the MLC works. Therapeutic field in radiation therapy. Multifield irradiation. Photon and electron dose distribution. Dose distribution during multifield irradiation. Intensity-modulated radiation therapy (IMRT). IMRT of the prostate gland. RapidArc - fast arc (VMAT). Positioning the irradiation target. Image-guided radiation therapy (IGRT). Irradiation of a moving target. Synchronization of irradiation with breathing (Gating). Irradiation of the left breast while holding the breath. The latest software package Varian TrueBeam version 2.5. Varian TrueBeam version 2.5 in MEDSCAN. Medscan website: http://medscannet.ru/ Facebook: / medscanrf Vkontakte: https://vk.com/medscanrf Instagram: / medscannet