External beam radiotherapy

Last revised by Dr Daniel J Bell on 11 Apr 2019

External beam radiotherapy (EBRT) (also known as teletherapy) is a form of ionizing radiation therapy delivered by a medical linear accelerator (or historically a cobalt-60 source) to a patient lying on a treatment bed. Megavoltage x-rays (4-25 MV) are the most commonly used. Alternative forms of EBRT include electron therapy, orthovoltage x-rays (0.1-1 MV) and particle therapy (proton therapy, neutron therapy and carbon ion therapy).

There are many types of external beam radiotherapy 1-5:

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