imaging of blood vessels (see also coronary angiography, lymphangiography). Fluoroscopic angiography is performed by injection of contrast medium during X-ray fluoroscopy. Positive (radiopaque) contrast medium containing iodine or, more recently, negative (radiolucent) gas (carbon dioxide) may be used. Digital subtraction increases the visibility of the vessels. Magnetic resonance angiography (MRA) can be performed either by injection of a magnetic resonance contrast agent (see contrast medium), which gives an increased signal from the blood, or by relying on the movement of blood to give a lack of signal in the plane being examined. These images can be reconstructed in two or three dimensions. Computerized tomographic angiography (CTA) uses a radiographic contrast agent, usually injected into a vein, to enhance the density of the blood. This can then be clearly seen on either two- or three-dimensional images, with other surrounding tissues hidden by the computer. Fluorescein angiography is a common method of investigation in ophthalmology. Fluorescein sodium is injected into a vein in the arm, from which it circulates throughout the body. Light of an appropriate wavelength is shone into the eye, causing the dye in the retinal blood vessels to fluoresce. This allows the circulation through the retinal blood vessels to be observed and photographed. Indocyanine green (ICG) angiography, using a newer dye, gives much better visualization of the choroidal circulation. It is particularly useful for visualization and treatment of choroidal neovascular membranes (see neovascularization).

The new mediacal dictionary. 2014.

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  • Angiography — Intervention Angiogram showing a transverse projection of the vertebrobasilar and posterior cerebral circulation …   Wikipedia

  • Angiography — An gi*og ra*phy, n. [Angio + graphy: cf. F. angiographie.] 1. (Anat.) A description of blood vessels and lymphatics. [1913 Webster] 2. (Med.) a diagnostic procedure in which the location and size of blood vessels may be visualized by taking an X… …   The Collaborative International Dictionary of English

  • angiography — (n.) 1731, from ANGIO (Cf. angio ) + GRAPHY (Cf. graphy) …   Etymology dictionary

  • angiography — [an΄jē äg′rə fē] n. [ ANGIO + GRAPHY] the process of making X ray pictures of blood vessels after first injecting a radiopaque substance angiographic [an΄jē ə graf′ik] adj …   English World dictionary

  • angiography — Radiography of vessels after the injection of a radiopaque contrast material; usually requires percutaneous insertion of a radiopaque catheter and positioning under fluoroscopic control. SEE ALSO …   Medical dictionary

  • angiography — angiographic /an jee euh graf ik/, adj. /an jee og reuh fee/, n. x ray examination of blood vessels or lymphatics following injection of a radiopaque substance. [1720 30; ANGIO + GRAPHY] * * * or arteriography X ray examination of arteries and… …   Universalium

  • angiography — noun Date: 1933 the radiographic visualization of the blood vessels after injection of a radiopaque substance • angiographic adjective • angiographically adverb …   New Collegiate Dictionary

  • angiography — noun A medical imaging technique in which an X ray image is taken to visualize the inside of blood vessels and organs of the body, with particular interest in the arteries, veins and the heart chambers. Syn: arteriography See Also: angiograph,… …   Wiktionary

  • angiography — [ˌandʒɪ ɒgrəfi] noun radiography of blood or lymph vessels, carried out after introduction of a radiopaque substance. Derivatives angiographic adjective angiographically adverb …   English new terms dictionary

  • angiography — an·gi·og·ra·phy …   English syllables

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