Computed Tomography (CT) scan
Computed tomography (CT) scan, or simply CT scan, is an X-ray procedure that generates a series of X-ray images of organs and internal structures, with each picture representing a "slice" of that internal structure. A computer then combines the "slices" to create a 2-dimensional cross-sectional view of structures inside the body. Three-dimensional images can be constructed by stacking two-dimensional images.
CT scans can be performed on any part of the body, including organs, bones, blood vessels and other tissues. One of the advantages of the CT scan over traditional radiography is that it enables us to see elements that could not otherwise be seen. In other words, CT scan highlights health problems that traditional X-rays are unable to detect.
What is the purpose of this test?
This examination is used to detect, diagnose or localize various health problems, such as tumours, cancer, infections, cardiovascular problems or internal injuries. The results also help determine treatment and follow-up.
Preparation
You may be asked not to eat or drink for a few hours before the examination, and to take laxatives to empty your bowels. Contact the centre where you will be having the scan for additional information.
Procedure
This examination takes place in a hospital or a specialized clinic radiology department. Here's how a CT scan is usually performed:
- You may be asked to:
- remove jewelry and, in some cases, dentures, hearing aids, glasses and hair accessories
- remove your clothes and put on a hospital gown
- You may receive a contrast agent, which is used to make better images.
- The contrast agent can be administered by mouth (drunk), injected into the veins or applied with a cannula through the rectum.
- After the examination, if you have received a contrast agent, it is recommended that you drink plenty of fluids to facilitate its elimination.
- You will be asked to lie down on the bed of the scanner.
- You should remain as still as possible throughout the procedure.
- A large ring will slide around the exam bed. The device won't touch you and you won't feel a thing as the X-ray beams penetrate your body.
- You will be alone in the examination room, but the medical staff will monitor the procedure through an observation window. You can communicate with each other over the intercom.
- The examination takes between 15 and 90 minutes to complete, depending on the area to be examined.
What you should know before going for this test
When you go in for a blood test or any other medical exam, it's always a good idea to bring a complete list of any prescriptions, over-the-counter medications, or natural health products you're taking. Unless otherwise advised, it's best to take your medications as usual on blood test days. If in doubt, don't hesitate to talk to your healthcare professional.
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The patient information leaflets are provided by Vigilance Santé Inc. This content is for information purposes only and does not in any manner whatsoever replace the opinion or advice of your health care professional. Always consult a health care professional before making a decision about your medication or treatment.