Computed tomography (CT scan)
An overview of computed tomography scans, what to expect during the procedure and resources for further information.
Overview
A computerized tomography scan (CT scan) is a diagnostic imaging procedure. It uses X-rays and technology to produce detailed high resolution images. These images are often called slices. As the scan progresses, slices are captured to get a detailed map of the body, including bones, organs and blood vessels.
Picture cutting an orange into slices. Each slice of orange shows a different cell form and amount of seeds. If you look at each piece, it will show you what is inside that part of the orange. When enough "slices" are captured, they are arranged into a three-dimensional map of what has been scanned.
A doctor will be able to pinpoint issues in almost any part of the body like:
- Blood clots
- Fractures
- Broken bones
- Tumours
- Internal Injuries
- Internal bleeding
- Vascular problems
- Heart disease
- Muscle disorders
- Aneurysms
Preparing for the scan
Before the scan, you are asked to change into a hospital gown. A technologist will review the procedure with you.
With contrast dye
If intravenous contrast dye is needed, it will be administered during the exam. Patients may experience a warm sensation throughout the body and a metallic taste in the mouth during the contrast injection. These sensations usually disappear in a few minutes. The dye allows your organs and bones to appear clearly within the images.
Before the scan
- Try not to eat or drink for an hour before your exam
- If CT oral contrast dye is ordered, drink it according to directions and time
Please tell your provider before the appointment if you have:
- Allergies to medications or contrast dye
- Diabetes
- Asthma
- Heart disease
- Kidney problems
- A thyroid condition
Please also let your provider know if you are pregnant, or suspect you may be pregnant.
During the scan
You will lie on your back or stomach during the scan and be brought into the machine. The bed moves into a tunnel-like space where the procedure takes place. Although it's small, the machine leaves plenty of room for you to feel comfortable and calm.
While the scan is in progress, a technologist will supervise you and then scans from the next room. You can ask to stop the test if you feel uncomfortable at any point. Your technologist will hear you through the microphone and will stop the scan.
Depending on the exam, the procedure takes about 15-30 minutes, and only 5-10 minutes are spent within the machine for your test.
After the scan
A radiologist will review your CT scan exam results and create a report. We will send results to your referring doctor, and they will contact you.
If you do not receive results after 14 days, please get in touch with your health care provider’s office.
Possible complications & side effects
There is radiation involved during a CT scan, but the exposure is kept as reasonably low as achievable, while producing a diagnostic scan at the same time. CT scans have not been shown to cause long-term harm in patients.
Side effects are rare. The most common side effects are minimal reactions to the contrast dye, which include:
- Itchiness
- Soreness
- A warm feeling across the body
- A metallic taste in the mouth
- A false sense of urination
It is rare, but a patient may not know they are allergic to contrast dye. This reaction may include sneezing, hives or difficulty breathing. Anyone with a reaction will be given care before they are sent home.
After the procedure, please drink lots of fluids to flush out any remaining contrast dye in your system. Regular diet and exercise can be resumed with no restrictions.
Support for Indigenous Peoples
The Indigenous Wellness Liaison Team is here to support your health journey. Team members offer cultural support and healthcare advocacy. Learn more below or call them at 604-682-2344,62937 or email IWL@providencehealth.bc.ca.
