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.
A CT angiography (CTA) scan is a special kind of CT exam that focuses particularly on the blood vessels, using a contrast material to make them show up clearly in the images. Common uses. CTA is used to examine blood vessels in areas including the brain, neck, chest and abdomen. Conditions that the exam can reveal include aneurysms and narrowing of the arteries. Safety. CT examinations improve health care and are an essential part of diagnosis and treatment planning.