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| CT Scan What Is a CT Scan? A Computed Tomography (CT), sometimes called a Computed Axial Tomography (CAT scan), is a painless radiology examination that gives a three-dimensional and unobstructed view of organs and structures that cannot be scene clearly on conventional x-rays. A CT scan combines a sophisticated x-ray system and a high-speed computer to produce slices of information. This exam produces pictures of the body, which allows a radiologist to see tissue and bone structure in detail. Where is it done? All CT scanners are located in hospitals in the Province of Ontario. Why is it important? CT scans offer a painless, non-invasive and accurate way to get information about the patient's body that may not otherwise be clearly seen. CT scanning an identify both normal and abnormal structures It has been called a "window" into the body and makes it possible to see various types of tissues and important information about the brain, spine, joints and internal organs which lead to early detection and diagnosis of disease. Because this examination uses radiation it is important to tell your doctor is you think you might be pregnant. What to expect? A CT scan is a large square machine with a hole in the centre. A patient lies still on a table that can move up or down a slide in and out of the hole in the CT. Inside the CT scanner is an x-ray tub which rotates around the patients body to produce the slice-like images. The machine makes a whirring and clicking noise as the x-ray moves around. Sometimes this exam requires the use of a contrast dye to help separate normal from abnormal tissues. Patients are alone in the room during the exam but they can be seen and heard at all times by the technologist. How long does it take? Anywhere from 5 to 30 minutes. Preparations for the CT scan If you have been notified that you will be having a contrast exam you may be asked not to eat or drink anything four several hours prior to your exam. Patients are able to drive themselves to and from the exam, and can continue their normal routine following the CT scan. |
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