of the Uniformed Services University of the Health Sciences
Bethesda, Maryland
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The
Department of Radiology and Radiological Sciences
of the Uniformed Services University of the Health Sciences Bethesda, Maryland |
| Angiography | |
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| Catheter Angiograms | CT Angiogram | |
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| Lateral ICA (internal carotid artery) arteriogram.
AVM - Arterio-Venous Vascular Malformation |
Arch Aortagram - oblique view.
Normal anatomy |
CT Angiogram - oblique view.
Pulmonary AVM |
ANGIOGRAMS AND ANGIOGRAPHYAngiography is the name of a procedure that produces a picture (the "angiogram") of blood vessels (arteries and veins) inside the body. Angiograms can be made with MRI and Ultrasound (no radiation). Angiograms can also be made by using CT or a catheter and an image intensifier/fluoroscope - both use X-Rays.Catheter Angiography is an "invasive procedure", because it requires the injection into the patient of a substance that is radiopaque (absorbs X-Rays). This substance is commonly called a "Contrast Agent" or "Dye". Usually a very tiny tube, that has a special shape, is used to place the contrast into a particular artery or vein. While the artery or vein contains this radiopaque material, it will block the X-Rays, and will cast a shadow of the injected vessels onto the X-Ray film or fluoroscope. This image will reveal the shape of the artery, and can help to diagnose an obstruction, blockage, or narrowing ("stenosis"). |
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