Image 276 a
Patient
CT abdomen
This is an x-ray examination. Multiple axial images are taken parallell to each other while the patient is moved slowly through a circular ring with the x-ray source and digital detectors. The examination may be performed without contrast medium, but most often both i.v. and oral contrast medium are given.
For visualization of arteries i.v. contrast is injected slowly starting the infusion 20-30 seconds before scanning. For venous visualization the scanning starts later. The organ of interest and the type of pathology determine the timing. In som cases multiple scans are performed at different times. Oral contrast medium is given to visualize the stomach and the bowels. The patient drinks the contrast in the waiting area before the examination.
Before scanning it has to be decided the thickness of the scans (1-10 mm) and the distance between the scans. Also the start area and the length of the scanning are decided. After scanning the images are presented as parallell axial images in cranial to caudal direction. The presentation of different views with abdominal window, liver window, skeletal window etc. is a post processing work for optimal visualization of the individual organs.
The study is being used for multiple indications including acute trauma. The general term is CT abdomen but specific examinations may be requested. Frequent examinations are CT liver, CT kidneys, CT urography, CT pancreas and CT abdominal aorta.
Originate from: Ulleval University Hospital,
updated: 29.01.2012