1.Fast examination Due to the scanning speed of 83ms, dual-source CT can image patients with rapid heart rate, irregularity and difficulty in breath-holding, and complete cardiovascular examination within seconds, and without the need for additional drugs and multi-sector acquisition and reconstruction. Wang Xiang, Department of Vascular Surgery, Shanghai Oriental Hospital 2. Half the radiation dose Although dual-source CT uses two imaging systems working simultaneously, even compared with the most energy-efficient single-energy CT scanner, its radiation dose under normal heart rate conditions is reduced by 50% because: first, it does not require multi-sector acquisition and is able to acquire cardiac images during one heartbeat; second, the SOMATOMDefinition automatically selects the fastest scanning speed according to the fast or slow heart rate; third, Siemens has also developed an adaptive dose modulation technique based on the ECG, which reduces the radiation dose during the fast-motion phase of the heart. The combined use of these technologies doubles the speed of image acquisition and reduces the damage caused by X-ray radiation, while the amount of contrast agent is reduced, reducing the risk of kidney function damage. The use of dual-source CT is safe even for multiple CT examinations in a short period of time. 3. Dual-source CT is especially suitable for vascular examinations Using dual-energy subtraction, images of only bones and images of only blood vessels can be separated by a single scan as needed, and it can further distinguish tissue types and describe lesion characteristics, including atheromatous plaques found in cardiovascular CT and masses found in tumor examinations. This is the first time in the history of CT that something has been done with tissue resolution. It provides a greater and more accurate basis for surgeons to determine the condition.