Radiation treatment, also called irradiation or radiotherapy, is the use of high-energy x-rays to kill cancer cells. A large machine called a linear accelerator directs x-rays to the precise portion of the body needing treatment. The treatment is given in doses measured in units called centigrays (cGy).

Radiation is usually given every day for a specific number of days, excluding weekends. This is called standard or conventional fractionation. Radiation given more than once a day is called accelerated fractionation, or hyperfractionation. it uses smaller amounts of radiation for each treatment.

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