Radiology

1) The science of high energy radiation and of the sources and the chemical, physical, and biologic effects of such radiation; the term usually refers to the diagnosis and treatment of disease. 2) The scientific discipline of medical imaging using ionizing radiation,...

Radiopaque

Impenetrable by x-rays or any other form of radiation. Radiopaque dye (one that is highlighted on x-rays) is used in cerebral angiograms to detect the degree of narrowing or obstruction of an artery or blood vessel in the brain, head, or neck; in the diagnosis of...

Radiotherapy

The medical specialty concerned with the use of electromagnetic or particulate radiation in the treatment of disease. The use of high-energy radiation from x-rays, gamma rays, neutrons, protons, and other sources to kill cancer cells and shrink tumors. Radiation may...

Rehabilitation

The return of function after illness or injury, often with the assistance of specialized medical professionals. A process to restore mental and/or physical abilities lost to injury or disease, in order to function in a normal or near-normal way. Rehabilitation can...

REM

Rapid eye movement (sleep). Deep sleep with rapid eye movements in which dreaming takes place. One of the five stages of sleep. During REM sleep, the eyes move rapidly while closed and dreams occur. REM sleep is the lightest stage of sleep, during which a person may...