Radiodensity
Radiodensity (pronounced: /ˌreɪdioʊˈdensɪti/) is a term used in radiology to describe the relative ability of a material to block or attenuate the passage of X-ray or other forms of radiation.
Etymology
The term is derived from the Latin radius meaning "ray" and the Latin densitas meaning "density".
Definition
Radiodensity is measured in Hounsfield units (HU), named after the British engineer Godfrey Hounsfield who developed the first computed tomography (CT) scanner. The HU scale is a linear transformation of the original linear attenuation coefficient measurement into one in which the radiodensity of distilled water at standard pressure and temperature (STP) is defined to be zero Hounsfield units (HU), while the radiodensity of air at STP is defined as −1000 HU.
Related Terms
- Radiopaque: Materials that are resistant to radiation, appearing white or light on radiographic images.
- Radiolucent: Materials that allow radiation to pass through, appearing dark on radiographic images.
- Radiotranslucent: Materials that allow some degree of radiation to pass through, appearing as varying shades of gray on radiographic images.
See Also
External links
- Medical encyclopedia article on Radiodensity
- Wikipedia's article - Radiodensity
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