Coronary arteries in the heart are very tiny with diameter between 0.2 ~ 0.3cm. The consecutive and fast 640-slice CT in synch with ECG shows micro lesion, discover minor calcification deposit in coronary arties, or calcification plaques or soft plaques in the size of sesame seeds, and can even evaluate the occlusion situation of the entire blood vessel, in order to diagnose heart disease early. Arteriosclerosis (or known as atherosclerosis) is commonly seen in large and medium arteries, including aortic artery and other branches, as well as coronary arties. In coronary arties, the area most frequently suffer from “sclerosis” start from the opening of coronary arteries (connection with aortic artery) to the frontend of the three branches, including: LAD, Segment 6, Segment 7 of LM/LCA, Segment 5, LCX, Segment 11, Segment 13, and RCA, Segment 1.