Lu Snapdragon, Department of General Surgery, Ningbo Second Hospital: Ultrasound examination of abdominal organs is often unclear because of abdominal distension, and there are often blind spots in the examination of the lower bile duct and the lower ureter in the usual examination. Generally speaking, you should fast before the examination and eat light food as much as possible the day before the examination. If there is abdominal flatulence examination is not clear, sometimes because the disease itself is disturbed, so that CT and other tests can be used as appropriate. If necessary, try some gastrointestinal motility drugs – such as morbutine or the like.