Multidetector CT (MDCT) without the use of contrast media can show the precise site of a bowel perforation, avoiding the need for surgeons to do exploratory surgery of the patient’s gastrointestinal tract to locate the problem, a new study shows.Multidetector CT (MDCT) without the use of contrast media can show the precise site of a bowel perforation, avoiding the need for surgeons to do exploratory surgery of the patient’s gastrointestinal tract to locate the problem, a new study shows.