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One of the most common angiograms performedis to visualize the blood in the coronary arteries. A long, thin, flexible tubecalled a catheters ram is used to administer the X-ray contrast agent at thedesired area to be visualized. The catheter is threaded into an artery in theforearm, and the tip is advanced through the arterial system into the majorcoronary artery. X-ray images of the transient radiocontrast distributionwithin the blood flowing inside the coronary arteries allows visualization ofthe size of the artery openings. Presence or absence of atherosclerosis oratheroma within the walls of the arteries cannot be clearly determined. Seecoronary catheterization for more detail.
To detect coronary artery disease, ComputedTomography (CT) Scan is better than Magnetic Resonance Imaging (MRI). Thesensitivity and specificity between CT and MRI were (97.2 percent and 87.4percent) and (87.1 percent and 70.3 percent), respectively. Therefore, CT(mainly multislice CT) is more accepted, more widely available, more favored bypatients, and more economic. Moreover, CT requires shorter breath-hold timethan MRI.
Angiography is also commonly performed toidentify vessels narrowing in patients with leg claudication or cramps, causedby reduced blood flow down the legs and to the feet; in patients with renalstenosis (which commonly causes high blood pressure) and can be used in thehead to find and repair stroke. These are all done routinely through thefemoral artery, but can also be performed through the brachial or axillary(arm) artery. Any stenoses found may be treated by the use of atherectomy.