Medical Definition of Therapy, external beam radiation

  • Medical Author:
    Melissa Conrad Stöppler, MD

    Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

Reviewed on 12/27/2018

Therapy, external beam radiation: Radiation focused from a source outside the body on the affected area (a cancer) within the body. It's much like getting a diagnostic x-ray, but using a more potent x-ray beam and giving it over a longer period of time per dose with usually multiple doses given over multiple days.

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Reviewed on 12/27/2018