An epinephrine-enhanced CT scan generally takes about 30 minutes. However, it mainly depends on the patient’s cooperation. If in case of non-cooperation, then it will take a little longer. If the exhalation and breath-holding are not cooperating well, it will cause image artifacts and the examination will need to be repeated. If the patient cooperates well, under the guidance of the doctor, the patient will not have any discomfort during the process, so that the epinephrine-enhanced CT scan can be successfully completed in one go. It should be noted that adrenaline-enhanced CT requires patients to fast for more than four hours before CT and inject contrast agent into the vein, the commonly used contrast agent in the clinic, the enhancement agent is iodine, which is forbidden to use if the patient is allergic to iodine. Adrenal enhancement CT has radiation, so too small children or pregnant women try not to do adrenaline CT, so as not to affect the physical development of children or the physical development of the fetus.