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NCI Dictionary of Cancer Terms

3-dimensional radiation therapy  listen  (3-dih-MEN-shuh-nul RAY-dee-AY-shun THAYR-uh-pee)

  A procedure that uses a computer to create a 3-dimensional picture of the tumor. This allows doctors to give the highest possible dose of radiation to the tumor, while sparing the normal tissue as much as possible. Also called 3-dimensional conformal radiation therapy and 3D-CRT.