Computed Tomography (CT)


The information below is intended for patients who are planning to undergo a Computed Tomography (CT) scan at Melbourne Radiology Clinic. A CT scan, previously also referred to as a CAT scan, is a test that uses an X-ray machine that spins around the patient to obtain detailed images known as cross sectional imaging. This means that many images of the body are produced as if the body had been sliced and turned onto its side for viewing. Modern CT scanners can produce multiple slices of the body in one single rotation and as such are now referred to as Multi-Slice or Multi-Detector CT scanners. The sophisticated computer within the CT scanner is then able to stack these slices together to create a 3-Dimensional image of the body part that has been studied.

Download PDF Patient Information Sheet Melbourne Radiology Clinic - Computed Tomography (CT)

CT scanning is an excellent medical tool that is used to detect a whole range of disorders and can be used to scan most parts of the body. In particular, it may be used to diagnose subtle fractures, tumours, tiny kidney stones, strokes and even narrowing or blockages of arteries. CT can also be used to look at the lungs, major body organs and bowel.


The following CT scans require NO preparation:

Unless otherwise specified at the time of booking, the following scans need X-ray dye (also known as contrast – see below) and therefore require fasting for 4 hours prior to the examination:


CT scanner

Depending on your examination, you may be asked by an automated voice to hold your breath. An injection of X-ray dye, known as contrast may need to be administered through a small plastic tube which has been inserted into an arm vein. Again, this depends on the examination that is being performed, however as a general rule, this is required for most CT examinations of the neck, chest, abdomen and pelvis. A CT scan looking for kidney stones only does NOT need this injection.


If you are to be given contrast, please refer to the fact sheet and consent form also available on the Melbourne Radiology Clinic website, or ask that this be emailed to you. Otherwise, you will be first provided with an information sheet when you arrive at Melbourne Radiology Clinic detailing the risks and benefits of the dye. This is then followed up by a brief questionnaire. The dye will only be given once you give your consent (permission) to do so, which will need to be formally documented on the information sheet with your signature. If it has been recommended to you by the staff at Melbourne Radiology Clinic that your scan requires dye it is because the information obtained during a scan with the dye yields significantly more information. We do understand however that no one likes needles, so if you have a particular objection to a needle or the dye, then naturally we may perform the scan without it.

All patients who have been administered dye need to wait in reception for 15 minutes before leaving in case there is a small chance of a delayed allergic reaction. Patients not administered contrast may leave immediately. Once you leave the clinic, you may resume normal activities and diet.


A radiologist, a medical doctor specialised in interpreting medical images for the purposes of providing a diagnosis, will then review the images and provide a formal written report. If medically urgent, or you have an appointment immediately after the scan to be seen by your doctor or health care provider, Melbourne Radiology Clinic will instantly have your results ready. Otherwise, the report will be received by your doctor or health care provider within the next 24 hours.


Whilst every effort is made to keep your appointment time, the special needs of complex cases, elderly and frail patients can cause unexpected delays. Your consideration and patience in these circumstances is appreciated.

Last Updated ( Wednesday, 18 June 2014 14:58 )