The precautions for CT scan of the lower abdomen, if it is a simple plain CT scan, there should be no metal-like objects within the examination area, such as metal belt buckles, key chains or metal objects in trouser pockets, etc. need to be removed. In addition, CT examination of the abdomen requires the patient to breathe in and out, and to listen to the oral command, and to close the breath when the doctor tells him to do so. If you have an abdominal enhancement CT, you should not eat at the meal before the examination, and you need to do the examination on an empty stomach. In addition, the patient should not do barium meal examination in the short term, if the patient has done barium meal, the intestine contains barium meal contrast agent, which will produce artifacts on the surrounding tissue lesions and affect the diagnosis of the lesions.