CT – Computed Tomography
What is a CT scan?
A CT scanner is a very sophisticated x-ray machine that acquires images of inside your body by rotating an x-ray tube around you. The information can be displayed in two ways. Firstly as a ’slice’ of your insides, much like taking a slice of bread from the middle of the loaf. Secondly, it can be summated and presented as a three dimensional structure, which can allow the radiologist to analyse it from multiple angles.
Is it safe?
The effective radiation dose from this procedure ranges from approximately 2 to 10 mSv, which is about the same as the average person receives from background radiation in three to five years.
You should always inform the CT technologist if there is any possibility that you are pregnant. CT scanning is generally not recommended for pregnant women unless medically necessary because of potential risk to the baby.
There is some risk of an allergic reaction to the contrast materials.
Is there any preparation?
As a general rule we ask you to fast for four hours prior to the scan in case you need to have a contrast injection, but when this is not necessary we will let you know at the time of your booking. For some abdominal scans you need to drink a special liquid that helps us to see your bowel more clearly.
What will happen to me?
For some scans you will need to take some special drinks beforehand or be injected with contrast material. You will receive an explanation of this when you book your appointment.
The CT technologist will take you to the CT room. They will go over the doctor’s referral with you and may discuss the scan with our radiologist beforehand.
You may need to get changed into an examination gown depending on the area to be examined.
You will lie on the CT examination couch, with the area to be scanned supported and secured (to minimise movement which reduces image quality), and a preliminary scan performed. The main scanning is then planned and completed. The couch will move through the ‘gantry’ (the body of the CT machine which contains the bore or doughnut you pass through) to allow the x-ray tube to rotate around the body part in question. You will be unaware of any movement around you as all of the moving parts are safely hidden away.
Where can I get a CT scan?
What does it cost?
Our prices page has a downloadable price list. Costs vary depending on exactly what is involved in the procedure. Please phone our Call Centre (04 978 5500) for more information.