Pituitary CT enhancement scanning is performed by injecting contrast agent intravenously and then performing multiple scans to detect lesions. 1. The contrast agent is injected through the patient’s anterior elbow vein or the vein at the back of the hand, with a dosage of 1.5~2ml/kg and a total amount of about 80~120ml. 2. The patient lies on the CT examination bed and the doctor uses an electric automatic pressure injector, which allows the injection time, dosage and flow rate to be selected as needed. 3. Multiple CT head scans are performed during the injection process. 4. Because iodine contrast can produce allergic reactions, patients need to retain venous access after the examination and observe for 30 minutes without adverse reactions before removing the needle. For example, for pituitary microadenoma, since the pituitary gland has no blood-cerebrospinal fluid barrier, after injection of contrast agent, the contrast agent enters and contours quickly, and the blood supply of the tumor is not as rich as that of the pituitary gland, the tumor strengthens slower and declines slower after the strengthening, so the two form a difference in density, which helps in diagnosis as well as treatment of the disease. Since the contrast agent contains iodine, an iodine allergy test is usually required before performing an enhanced CT scan. Patients are advised to choose the appropriate way to perform the test under the guidance of their doctors.