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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Radiation therapy Radiation therapy
    Radiation therapy: The use of high-energy rays to damage cancer cells, stopping them from growing and dividing. Like surgery, radiation therapy is a local treatment that affects cancer cells only in the treated area. Radiation can come from a machine (external radiation or from an a small conta...
  2. Radiation therapy, 3-D Radiation therapy, 3-D
    Radiation therapy, 3-D: A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target it as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. Also known as targeted radiation therapy and as c...
  3. Radiation therapy, conformal Radiation therapy, conformal
    Radiation therapy, conformal: A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conformat...
  4. Radiation therapy, conformational Radiation therapy, conformational
    Radiation therapy, conformational: A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D or conf...
  5. Radiation therapy, external Radiation therapy, external
    Radiation therapy, external: Radiation therapy in which the source of radiation is a machine outside the body....
  6. Radiation therapy, internal Radiation therapy, internal
    Radiation therapy, internal: Radiation therapy in which a small container of radioactive material is implanted in the body, in or near the cancerous tumor....
  7. Radiation therapy, stereotactic Radiation therapy, stereotactic
    Radiation therapy, stereotactic: The use of a number of precisely aimed beams of ionizing radiation, each coming from different directions and meeting at a specific point, to deliver radiation treatment to that spot....
  8. Radiation therapy, targeted Radiation therapy, targeted
    Radiation therapy, targeted: A procedure that uses computers to create a 3-dimensional picture of the tumor in order to target the tumor as accurately as possible and give it the highest possible dose of radiation while sparing normal tissue as much as possible. It is also known as 3-D conformal (or...
  9. Radiation toxicity Radiation toxicity
    Radiation toxicity: See: Acute radiation syndrome....
  10. Radiation, background Radiation, background
    Radiation, background: See: Background radiation....
  11. Radiation, food Radiation, food
    Radiation, food: See: Food irradiation....
  12. Radiation, ultraviolet Radiation, ultraviolet
    Radiation, ultraviolet: Invisible rays that are part of the energy that comes from the sun. Ultraviolet radiation can burn the skin and cause skin cancer. Ultraviolet radiation is made up of three types of rays -- ultraviolet A, ultraviolet B, and ultraviolet C. Although ultraviolet C is the most ...
  13. Radical dissection Radical dissection
    Radical dissection: Removal of not only affected tissue, but also nearby tissue that may be covertly affected....
  14. Radical neck Radical neck
    Radical neck: See: Radical neck dissection....
  15. Radical neck dissection Radical neck dissection
    Radical neck dissection: A surgical procedure involving the removal of a tumor from the neck with an additional margin of normal tissue of at least 2 cm together with the removal of the lymph nodes from the neck. A radical dissection is the removal of not only affected tissue, but also of nearb...