A CT scan is a type of diagnostic imaging procedure that emits narrow x-ray beams through the body to capture images of organs and other structures. These images are converted into pictures that can be viewed on a monitor and evaluated by a radiologist. Before the procedure, you may be asked to fast or refrain from drinking any liquids for a period of time. During a CT scan, you will be provided a gown and positioned comfortably on a motorized examination table that will move into the CT scanner. Your radiologist will likely ask you to avoid movement during a CT scan, in order for the CT machine to capture the most detailed images possible. In some cases, usually during abdomen or chest exams, you may even be asked to hold your breath for small periods of time during the scan.