Enhanced CT is an examination based on plain CT with contrast injection. Enhanced CT examination time is generally about 10-30 minutes, the specific length of time is mainly related to the examination site, and individual patients will vary. In most cases, the examination time is about 10 minutes; for coronary artery enhanced CT, the need for patients to carry out respiratory training, the overall time will be prolonged, most of them can be controlled within 15 minutes; check the urinary excretion or liver hemangioma, to be delayed to 30 minutes or so, and the contrast agent concentration, metabolism related. Enhanced CT examination, mainly to observe the lesion for the uptake of contrast medium, to determine the specific blood supply; itself has radiation, avoid doing related examinations during pregnancy; part of the population will have an allergic reaction after injecting the contrast medium, to communicate with the doctor in time. If you have any symptoms of physical discomfort, you should go to the hospital in time and consult a specialist for guidance.