CT or Computed Tomography creates a 3 D image of the organ under investigation. Very often patients are requested to drink a fluid prior to the examination which will allow imaging of the bowels. For some examinations a contrast dye will be injected intravenously which will visualise the blood vessels.
CT examinations are performed for several reasons including an internal bleed or a fracture.
Please watch this video for a guided tour through MRI and CT scanning: