CT scan
Introduction
Acomputerised tomography(CT) scan uses X-rays and a computer to create detailed images of the inside of the body.
CT scans are sometimes referred to as CAT scans or computed tomography scans.
They're carried out in hospitalby specially trained operators called radiographers andcan be done while you're staying in hospital or during a short visit.
Medically Reviewed by a doctor on 4 Jan 2017
Introduction
Read about why CT scans are carried out, and find out what happens before, during and after the scan.
What happens during a CTscan
Duringthe scan, you'll usually lie on your back on a flat bed that passes into the CT scanner.The scanner consists of a ring that rotates arounda small section of your body as you pass through it. Unl
What happens afterwards
You shouldn't experience any aftereffects from a CT scan and can usually go home soon afterwards. You can eat and drink, go to work and drive as normal.If a contrast was used, youmay be advised to wai
Are CT scans safe?
CT scans are quick, painless and generally safe. However, there's a small risk you could have an allergicreaction to the contrast dye usedand you will be exposed to X-rayradiation.The amount of radiat
When CT scans are used
CT scans can produce detailed images of many structures inside the body, including the internal organs, blood vessels and bones.They can be used to: diagnose conditions includingdamage tobones,injurie
Preparing for a CT scan
Your appointment letter will mention anything you need to do to prepare for your scan.You may be advised to avoideating anything forseveral hours before your appointment, to help ensure that clear ima
Before having a CT scan
Before havingthe scan,you may be given aspecial dye called a contrast to help improve the quality of the images. This may be swallowed in the form of a drink, passed into your bottom (enema), or injec
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