Definition: A clad coin is one that has multiple layers of metal in it; most current U.S. clad coins consist of an inner core of copper, with outer layers of a silver-colored nickel-copper alloy. Examples of this type of clad coin are the U.S. Dime, Quarter, and Half Dollar.
âChronic Total Occlusion Intervention. Chronic total occlusion (CTO) is a complete blockage of a coronary artery that has been in place for 30 days or longer. CTOs are very common, occurring in 15 to 20 percent of patients with significant coronary artery disease. The condition can cause severe angina (chest pain) and lead to a lower quality of life.
1 CTA is used as a noninvasive method for detecting blockages in the coronary arteries. 2  A CTA can be performed much faster (in less than one minute) than a cardiac catheterization, with potentially less risk and discomfort as well as decreased recovery time.3  View photos of CT angiography. CTA is also called multi-slice computed tomography (MSCT), cardiac CT or cardiac CAT. 2  During CTA, x-rays pass through the body and are picked up by detectors in the scanner, that produce 3D images on a computer screen.