Angiogram: Difference between revisions
No edit summary |
No edit summary |
||
| Line 4: | Line 4: | ||
{{editor help}} | {{editor help}} | ||
==Overview== | |||
'''Angiography''' or '''arteriography''' is a [[medical imaging]] technique in which an [[X-ray]] picture is taken to visualize the inner opening ([[lumen (anatomy)|lumen]]) of blood filled structures, including [[artery|arteries]], [[vein]]s and the [[heart chamber]]s. Its name comes from the [[Greek language|Greek]] words ''angeion'', "vessel", and ''graphien'', "to write or record". The X-ray film or image of the [[blood vessel]]s is called an '''angiograph''', or more commonly, an '''angiogram'''. | '''Angiography''' or '''arteriography''' is a [[medical imaging]] technique in which an [[X-ray]] picture is taken to visualize the inner opening ([[lumen (anatomy)|lumen]]) of blood filled structures, including [[artery|arteries]], [[vein]]s and the [[heart chamber]]s. Its name comes from the [[Greek language|Greek]] words ''angeion'', "vessel", and ''graphien'', "to write or record". The X-ray film or image of the [[blood vessel]]s is called an '''angiograph''', or more commonly, an '''angiogram'''. | ||
Revision as of 02:38, 12 February 2009
|
WikiDoc Resources for Angiogram |
|
Articles |
|---|
|
Most recent articles on Angiogram |
|
Media |
|
Evidence Based Medicine |
|
Clinical Trials |
|
Ongoing Trials on Angiogram at Clinical Trials.gov Clinical Trials on Angiogram at Google
|
|
Guidelines / Policies / Govt |
|
US National Guidelines Clearinghouse on Angiogram
|
|
Books |
|
News |
|
Commentary |
|
Definitions |
|
Patient Resources / Community |
|
Patient resources on Angiogram Discussion groups on Angiogram Directions to Hospitals Treating Angiogram Risk calculators and risk factors for Angiogram
|
|
Healthcare Provider Resources |
|
Causes & Risk Factors for Angiogram |
|
Continuing Medical Education (CME) |
|
International |
|
|
|
Business |
|
Experimental / Informatics |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Angiography or arteriography is a medical imaging technique in which an X-ray picture is taken to visualize the inner opening (lumen) of blood filled structures, including arteries, veins and the heart chambers. Its name comes from the Greek words angeion, "vessel", and graphien, "to write or record". The X-ray film or image of the blood vessels is called an angiograph, or more commonly, an angiogram.
The Portuguese physician and neurologist Egas Moniz, Nobel Prize winner in 1949, developed in 1927 the technique of contrasted x-ray cerebral angiography to diagnose several kinds of nervous diseases, such as tumors and arteriovenous malformations. He is usually recognised as one of the pioneers in this field. With the introduction of the Seldinger technique in 1953, the procedure became markedly safer as no sharp introductory devices needed to remain inside the vascular lumen.
Angiograms require the insertion of a catheter into a peripheral artery, e.g. the femoral artery.
As blood has the same radiodensity as the surrounding tissues, a radiocontrast agent (which absorbs X-rays) is added to the blood to make angiography visualization possible. The angiographic X-ray image shows shadows of the openings within the cardiovascular structures carrying blood (actually the radiocontrast agent within). The blood vessels or heart chambers themselves remain largely to totally invisible on the X-ray image.
The X-ray images may be taken as either still images, displayed on a fluoroscope or film, useful for mapping an area. Alternatively, they may be motion images, usually taken at 30 frames per second, which also show the speed of blood (actually the speed of radiocontrast within the blood) traveling within the blood vessel.
The most common angiogram performed is to visualize the blood in the coronary arteries. A long, thin, flexible tube called a catheter is used so as to administer the radiocontrast agent at the desired area to be visualized. The catheter is threaded into an artery in the groin or forearm, and the tip is advanced through the arterial system into one of the two major coronary arteries. X-ray images of the transient radiocontrast distribution within the blood flowing within the coronary arteries allows visualization of the size of the artery openings. Presence or absence of atherosclerosis or atheroma within the walls of the arteries cannot be clearly determined. See coronary catheterization for more detail.
Angiography is also commonly performed to identify vessel narrowing in patients with retinal vascular disorders, such as diabetic retinopathy and macular degeneration.
Types of angiographs
- Cerebral angiography
- Coronary angiography
- Peripheral angiography (arm or leg)
- Visceral angiography (the abdominal organs, or viscera)
- Pulmonary angiography (lungs)
- Lymphangiography (lymph vessels)
- Right heart ventriculography (looking at the right side of the heart)
- Left heart ventriculography (looking at the left side of the heart)
- Aortography (looking at the aorta, the major artery from the heart)
- Retinal angiography
- Magnetic Resonance Angiography
Historic usage
The term angiography, or angeiography, was originally used of a description of the weights, measures, vessels, etc, used by several nations.
External links
- RadiologyInfo - The radiology information resource for patients: Angiography procedures
- Cardiac Catheterization from Angioplasty.Org
- Angiography Equipment from Siemens Medical
- Cardiovascular and Interventional Radiological Society of Europe
- Worldwide Angiography Manufacturer
cs:Angiografie de:Angiografie it:Angiografia nl:Angiografie no:Angiografi fi:Angiografia