Definitions for radiation therapy
This page provides all possible meanings and translations of the word radiation therapy
Random House Webster's College Dictionary
radiotherapy, radiation therapy, radiation, actinotherapy, irradiation(noun)
(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
The use of ionizing radiation to treat disease, especially cancer.
Radiation therapy, radiation oncology, or radiotherapy, sometimes abbreviated to XRT or DXT, is the medical use of ionizing radiation, generally as part of cancer treatment to control or kill malignant cells. Radiation therapy may be curative in a number of types of cancer if they are localized to one area of the body. It may also be used as part of adjuvant therapy, to prevent tumor recurrence after surgery to remove a primary malignant tumor. Radiation therapy is synergistic with chemotherapy, and has been used before, during, and after chemotherapy in susceptible cancers. Radiation therapy is commonly applied to the cancerous tumor because of its ability to control cell growth. Ionizing radiation works by damaging the DNA of exposed tissue leading to cellular death. To spare normal tissues, shaped radiation beams are aimed from several angles of exposure to intersect at the tumor, providing a much larger absorbed dose there than in the surrounding, healthy tissue. Besides the tumour itself, the radiation fields may also include the draining lymph nodes if they are clinically or radiologically involved with tumor, or if there is thought to be a risk of subclinical malignant spread. It is necessary to include a margin of normal tissue around the tumor to allow for uncertainties in daily set-up and internal tumor motion. These uncertainties can be caused by internal movement and movement of external skin marks relative to the tumor position.
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"radiation therapy." Definitions.net. STANDS4 LLC, 2014. Web. 23 Apr. 2014. <http://www.definitions.net/definition/radiation therapy>.