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CT Angiogram - Computed Tomography Heart Scan
What is a CT Angiogram? The term angiogram can be confusing as there are two types of angiogams that can be performed, and each can be used to look at arteries and veins throughout the body. The two main classes of angiograms may be referred to as "catheter" angiograms and "non-invasive" angiograms (See Angiogram vs. CT angiogram). Non-invasive angiograms use imaging technologies such as CT (computed tomography) or MRI (magnetic resonance imaging). Catheter angiograms have been present for a longer period of time, and refer to a study where dye is injected into the bloodstream through a vein or artery using a catheter (a small plastic device). The catheter is introduced into the vein or artery by a small incision, and is moved forward into the artery being studied to inject contrast material (which improves the outline of the artery). The physician then evaluates the arteries and veins by looking at 2-dimensional X-ray images. These angiograms are still the diagnostic test of choice under certain conditions as they provide a highly detailed outline of the artery or vein being studied. The downside to a catheter angiogram is that it is more invasive to the patient and sedation is used. Catheter angiograms also have a higher risk of serious adverse events, including rupturing a blood vessel and infection. Although the risks are more serious, they occur relatively infrequently. CT angiograms refer to angiograms completed using computed tomography technology. (MRI may be used and is referred to as "MR" angiography, please see our section CT vs. MRI). These studies are increasing in popularity as CT technology improves and image quality becomes better. There are multiple areas of the body that may be studied, including a CT angigoram heart, carotid CT angiogram to evaluate the arteries to the brain, a renal CT angiogram to evaluate the arteries to the kidney, an aortic CT angiogram to evaluate the aorta, and a coronary artery CT angiogram to evaluate the arteries to the heart. The use of CT coronary angiograms is an example of a study that was almost always performed using catheter techniques until recent advances in CT technology allowed for high quality images. Coronary arteries supply the heart itself with blood, and an insufficient supply of blood may lead to a heart attack. A physician usually orders an angiogram to determine the severity of narrowing of the arteries. If there is narrowing of the coronary arteries, for example, a physician may suggest coronary artery bypass surgery or the placement of a stent to ensure that there is adequate blood supply to the heart. • National Library of Medicine - CT Scans • Society for Vascular Surgery - Heart Scan • CT Angiography from RSNA • Calcium Scoring |
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Home | CTA vs: Angiogram, MRI | Procedure & Risks | Aortic, Carotid, Coronary, Renal | Scan Centers | FAQ | Sitemap |