Radiotherapy aims to kill the cancerous tissue and reduce the damage of normal tissue. There are two purposes of using radiotherapy, cure the patient and relieve the pain. There are three treatment types: teletherapy, intracavitary and interstitial therapy. Teletherapy uses external photon and electron, intracavitary treatment inserts radioactive sources into body cavities, interstitial therapy involves inserting radioactive sources into tumours surgically.
Linear accelerator is used for teletherapy, which generates photon and electron beams. The source is an electron gun.
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