external radiation therapy
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Related to external radiation therapy: Internal Radiation Therapy
external radiation therapy (ERT)
the therapeutic application of ionizing radiation from an external beam of a kilovoltage radiographic machine; a megavoltage cobalt 60 machine; or a supervoltage linear accelerator, cyclotron, or betatron. ERT is used most frequently in the treatment of cancer but also in the therapy of keloids and some dermatological conditions and in counteracting the body's physiological rejection of transplanted organs.
External radiation therapy
Radiation therapy that focuses high-energy rays from a machine on the area of the tumor.
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