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Mr contrast rsna4/5/2023 ![]() ![]() Guidelines about eating and drinking before an MRI exam vary at different facilities. You may wear a gown during the exam or allowed to wear your own clothing if it is loose-fitting and has no metal fasteners. MRA is also used as a substitute for CT angiography when iodinated contrast material cannot be used. screen individuals for arterial disease, especially patients with a family history of it.evaluate stenosis and obstructions of vessels.look at congenital abnormalities in blood vessels, especially arteries in children (e.g., malformations in the heart or other blood vessels due to congenital heart disease).examine pulmonary arteries in the lungs to detect pulmonary embolism (blood clots, such as those traveling from leg veins) or pulmonary AVMs.show the extent and severity of coronary artery disease and its effects and plan for an intervention, such as a coronary bypass and stenting.identify dissection or splitting in the aorta in the chest or abdomen or its major branches.evaluate arteries feeding a tumor prior to surgery or other procedures such as chemoembolization or selective internal radiation therapy.detect injury to one or more arteries in the neck, chest, abdomen, pelvis, or limbs following trauma.guide interventional radiologists and surgeons making repairs to diseased blood vessels, such as implanting stents or evaluating a stent after implantation.detect disease in the arteries to the kidneys or visualize blood flow to help prepare for a kidney transplant or stent placement.detect plaque disease that has narrowed the arteries to the legs and help prepare for angioplasty/stent placement or surgery.identify a arteriovenous malformation inside the brain or elsewhere.detect atherosclerotic (plaque) disease in the carotid artery of the neck, which may limit blood flow to the brain and cause a stroke.identify abnormalities, such as aneurysms, in the aorta, both in the chest and abdomen, or in other arteries.abdomen (such as the kidneys and liver).What are some common uses of the procedure?ĭoctors use MRA to examine blood vessels in key areas, including the: The doctor or the technologist will usually administer the contrast material by placing a small intravenous (IV) catheter in a vein in your arm. Gadolinium is less likely to cause an allergic reaction than the iodinated contrast material used in CT angiography. If needed, an injection of a gadolinium-based contrast material may be used. This exam, like all MR-based exams, does not use radiation.Īn MRA exam may or may not use contrast material. In magnetic resonance angiography (MRA), a powerful magnetic field, radio frequency waves and a computer are used to evaluate blood vessels and help identify abnormalities. fluoroscopy ( x-rays) to help place catheters into blood vessels and inject contrast to help visualize them.In some cases, contrast material is used. Angiography exams produce pictures of major blood vessels throughout the body. If you have a fear of close spaces or anxiety, consider asking your doctor for a mild sedative prior to the exam.ĭoctors use angiography to diagnose and treat blood vessel-related diseases. Leave jewelry at home and wear loose, comfortable clothing. Unless your doctor tells you otherwise, take your regular medications as usual. Guidelines about eating and drinking before your exam vary between facilities. Sometimes, your doctor will give you a card with information about your implant. Most orthopedic implants pose no risk, but you should always tell the technologist if you have any devices or metal in your body. The magnetic field is not harmful, but it may cause some medical devices to malfunction. Tell your doctor about any health problems, recent surgeries, allergies and whether you are pregnant. The contrast material used for MRA is less likely to cause an allergic reaction than the contrast material used for computed tomography (CT). This exam does not use radiation and may require an injection of contrast material. MR angiography (MRA) uses a powerful magnetic field, radio waves and a computer to evaluate blood vessels and help identify abnormalities. ![]()
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