Whether or not a patient can eat before a CT exam is related to the part of the body that the patient is having examined, as well as the type of exam that the patient is having done. For patients doing CT plain scanning, if the patient is doing abdominal CT examination, such as liver, spleen, gallbladder, pancreas, and gastrointestinal tract, the patient is required to have an empty stomach. This is because eating: 1. on the one hand, it will affect the visualization of gallbladder disease; 2. on the other hand, the gas in the intestines as well as the peristalsis of the intestines will also have an impact on the diagnosis. If the patient is doing other parts of the CT scanning, eating has no effect.3, there is another situation, if the patient is doing the enhanced CT examination, no matter what part of the patient is doing the enhanced CT, because to use the contrast agent in the process of examination, it is easy to have an allergic reaction, so the patient must also have an empty stomach.