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.
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.
The smaller of the two bones of the forearm, located on the thumb’s side. (The larger bone in the forearm is the ulna.)
A radioactive element that is formed, as a gas, during the breakdown of radium. Radon exposure is the second leading cause of lung cancer deaths in the United States, after smoking. Radon gas continuously seeps into the air from uranium- and radium-bearing soil and rock. Well water can be contaminated with radon and may carry […]
- Raeder's syndrome
a year). The other main pattern of cluster headache is termed “chronic” (and is also known as chronic migrainous neuralgia). It may come out of the blue or emerge several years after an episodic pattern. It is characterized by the absence of sustained periods of remission. The episodic and acute forms of cluster headache may […]
Any of several weedy composite herbs that produce a pollen to which many people are allergic. Of all allergy sufferers in the US, 75 percent are allergic to ragweed.