Computerised Tomography (CT) sometimes called a CAT scan, uses special x-ray equipment to obtain images from different angles around the body, and then uses computer processing to show a cross-section of the body, including bones and organs. The CT Scan does not replace plain X-rays, but gives additional information with greater detail.
How does a CT examination work?
A CT scanner consists of a short, tube-shaped tunnel ("gantry"), in which a system of X-ray generator and detectors rotates around your body and creates cross-section images. The examination is performed from a control panel outside of the CT room. A computer calculates individual cross-section images ("slices") from the collected data, which can be displayed on a monitor and exposed on films, similar to X-ray images.
CT scanning is particularly useful because it can show several types of tissue at once including, lung, bone, soft tissue, and blood vessels with great clarity. It can more easily diagnose problems such as cancers, heart disease, infectious disease, injury, and musculoskeletal disorders.
A CT examination often requires the use of a special x-ray dye or contrast material to enhance the visibility of certain tissues or blood vessels.
Depending on the type of examination your doctor has requested, you may need to arrive an hour early in order to drink some contrast; this will help highlight the bowel from other surrounding tissues. You may also need to have a injection of a different type of contrast that is made up of a mix of water and iodine. This is used to highlight vessels that have a blood supply.
A typical examination will take between 10 to 20 minutes to complete, but may take longer if we need to have a delay and then rescan you.
Results
A radiologist, who is a specialist physician experienced in CT and other radiology examinations, will analyse the images and send a signed report with his or her interpretation to your referring doctor. Your doctor will then discuss the results with you.
Preparing for the Procedure
If you are having a CT Scan of your abdomen, you may need to drink special fluid to outline the stomach and bowel which requires you to attend one hour before your examination time.
Wear comfortable, loose-fitting clothing. As metal objects can affect the image, avoid clothing with zippers and press studs.
You may also be asked to remove hairpins, jewellery, eyeglasses, hearing aids, and any removable dental work, depending on the part of the body that is being scanned.
You may be asked not to eat or drink anything for one or more hours before the exam.
Women should always inform their doctor or x-ray radiographer if there is any possibility that they are pregnant.
With the exception of some Spinal CT, some preparation will be required.
Allergies, Contra Indications
Advise the radiologist or radiographer if you have any allergies, especially to medications or iodine, or if you have a history of:
• Diabetes
• Asthma
• Heart Conditions
• Kidney problems
• Thyroid Conditions
Please Ask
We know that most patients are anxious about having tests performed. If you do have any questions or concerns, please ask our staff.
CT is available at the following locations. Patient Information brochure.
- North Melbourne - Flemington Road
- Melton - Unitt Street
- Wendouree - Howitt Street
- St John of God - Geelong
- St John of God - Ballarat
- East Court - Ryrie Street
Dual Source CT is available at:
- East Court. Patient Information brochure.