64-row CT is not harmful to the human body, CT examination using radiation, radiation dose within the national regulations of the safety range. 64-row CT compared to ordinary rows of lower CT, scanning time is shorter, the patient suffers from a lower dose of radiation, the general population is not more than 2-3 times a year is not a problem, compared with the diagnostic value of the radiation is worth mentioning. 64-row CT is not only in the diagnosis of cardiovascular disease, but also can be used for three-dimensional reconstruction of bone and joint system, making the image more three-dimensional sense and more realistic, greatly improving the diagnostic accuracy. 64-row CT not only has great advantages in diagnosing cardiovascular diseases, but also can be used for three-dimensional reconstruction of bone and joint system, which makes the image more three-dimensional and realistic, and the diagnostic accuracy has been greatly improved.