External radiation. Definition

Medical Definition: External radiation

Type of radiation therapy uses a machine to aim high-energy rays at the cancer from outside the body. It is no cancer treatment in which the radiation source is some distance from the patient in large equipment, such as cobalt unit and linear electron accelerator. In this type of treatment, which is the most common, patients come daily as outpatients for a period of time varies, depending on the disease being treated. The radiation may be gamma rays, X rays or electrons. Also called external beam radiotherapy.

* Automatic translation