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NCI Dictionary of Cancer Terms


charged-particle radiation therapy  listen  (… PAR-tih-kul RAY-dee-AY-shun THAYR-uh-pee)

  A type of external radiation therapy that uses a special machine to make invisible, high-energy particles (protons or helium ions) that kill cancer cells. This type of radiation may cause less damage to nearby healthy tissue than radiation therapy with high-energy x-rays.