Radiopaque
Opaque to one or another form of radiation, such as X-rays. Radiopaque objects block radiation rather than allow it to pass through. Metal, for instance, is radiopaque, so metal objects that a patient may have swallowed are visible on X-rays. Radiopaque dyes are used in radiology to enhance X-ray pictures of internal anatomic structures. The opposite of radiopaque is radiolucent.
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Sensitive to X-rays and other forms of radiant energy. For example, if a tumor is radiosensitive, it is potentially treatable with radiation therapy. The opposite of radiosensitive is radioinsensitive.
- Radiotherapy
The treatment of disease with ionizing radiation. Also called radiation therapy. In radiotherapy, high-energy rays are often used to damage cancer cells and stop them from growing and dividing. A specialist in the radiation treatment of cancer is called a radiation oncologist. Like surgery, radiation therapy is a local treatment; it affects cancer cells only […]
- Radiotherapy, stereotactic
Radiation therapy in which a number of precisely aimed beams of ionizing radiation coming from different directions meet at a specific point, delivering the radiation treatment to that spot.
- Radium
The radioactive element discovered by Marie and Pierre Curie in 1898. Since the discovery of radium, many radioactive isotopes have been used for both the diagnosis and the treatment of diseases.
- Radius
The smaller of the two bones of the forearm, located on the thumb’s side. (The larger bone in the forearm is the ulna.)