A CT scan takes a number of pictures (x-rays) from different angles, from which the computer then builds up a 3-D picture of the inside of your body. It is like taking a picture of a slice of the body. It can be used to look at one part of the body or all of it. It isn’t painful.

what happens?

You may need to have a drink or an injection of a dye called contrast which makes certain areas of the body show up more clearly. This can make you feel hot all over. If the scan is of your head, you may be able to keep your own clothes on, but otherwise you will be asked to undress to your underwear and put on a gown. You will also have to remove any jewellery because metal can affect the scan.

The machine looks a bit like a giant polo mint which a couch slides through.  It is open at both ends.  The radiographer will help you to get on the couch which you will lie on, usually on your back.  It is quite hard and can be uncomfortable. The radiographer then leaves the room, but you can still talk to them through an intercom. They will tell you when the scan is going to start and will ask you to lie still, but you can breathe normally. The scan lasts about 30 minutes, sometimes a bit longer. It is not painful.

Some people find it difficult to lie still and some find that they feel anxious and /or claustrophobic. If you let them know beforehand, they will be able to help you through it. If you are very anxious, they may give you a tablet or injection to help you relax. Closing your eyes and thinking about something else can be helpful.

afterwards

You will be able to go home afterwards.  It can take anything from a few days to a couple of weeks for the results to be ready. Specialist doctors need to look at the scan and report the results.