Radiodensity

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Radiodensity is the property of relative transparency to the passage of X-rays through a material. Radiolucent indicates greater transparency to X-ray photons. Radiodense indicates greater opacity to X-ray photons.

X-rays are part of the electromagnetic spectrum, with photon energies above visible (and ultraviolet) light photons. They are distinguished from gamma rays in that they are produced not by transitions within the atomic nucleus, but either by deceleration of a charged particle or by the transition of state of orbital electrons. Diagnostic X-rays are produced using X-ray tubes.

The radio waves portion of the electromagnetic spectrum represent much lower energy/frequency photons than visible light. Thus, referring to the property of X-ray density as radiodensity appears contradictory by current knowledge, but is still used as a historical artifact.

Though radiodensity is commonly used in a qualitative comparison perspective, it can also be quantified according to the Hounsfield scale, which is fundamental to CT scanning applications. Specifically, distilled water is specified on the Hounsfield scale, as a reference, as 0 units ("HU", or Hounsfield units), air is specified as -1000 HU. These were chosen as universally available references and were oriented to the key application CT was developed for: imaging the internal anatomy of living creatures based on organized water structures and mostly living in air, e.g. humans.

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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .