Radio opaque
Radio opaque
Radio opaque (pronunciation: /ˈreɪdi.oʊ ˈoʊpeɪk/) is a term used in the field of radiology to describe substances or tissues that do not allow X-ray or other forms of radiation to pass through them.
Etymology
The term 'radio opaque' is derived from the Latin word 'radius' meaning 'ray' and the French word 'opaque' meaning 'not able to be seen through'.
Definition
Radio opaque substances are those that do not allow the passage of electromagnetic radiation, such as X-rays. These substances appear white or light grey on radiographic images. This is because the X-rays are absorbed by the radio opaque substance, preventing them from reaching the film or detector.
Related Terms
- Radiolucent: A term used to describe substances that allow the passage of X-rays or other forms of radiation. These substances appear dark on radiographic images.
- Radiodensity: The ability of a substance to absorb or block radiation, often measured in Hounsfield units (HU).
- Contrast agent: A substance used to increase the contrast of structures or fluids within the body in medical imaging.
Usage in Medical Field
In the medical field, radio opaque substances are often used as contrast agents in radiographic imaging to improve the visibility of internal structures. For example, barium and iodine compounds, which are radio opaque, are commonly used in procedures such as barium swallow and intravenous urography.
See Also
External links
- Medical encyclopedia article on Radio opaque
- Wikipedia's article - Radio opaque
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