**1. Introduction**

Atherosclerosis is a disease in which a plaque builds up inside your arteries. The plaque builds up of fat, cholesterol, calcium, and other substances found in the blood. Over time, plaque hardens and narrows your arteries [1]. Arteries are blood vessels that carry oxygen-rich blood to organs in the body, and this plaque limits the flow of oxygen-rich blood to organs and other parts of body. Thus, atherosclerosis can lead to serious problems, including heart attack, stroke, or even death. Percutaneous transluminal coronary angioplasty (PTCA) is a technique used to widen the narrowing in a coronary artery without surgery.
