CT Scans

A CT scan (also called computed tomography or CAT scan) is a type of medical imaging that uses X-rays and computer technology to create detailed images of the inside of your body. Unlike regular X-rays, which provide only two-dimensional images, a CT scan creates cross-sectional, 3D images that help doctors see organs, tissues, and bones more clearly.

Mr Ferguson may recommend a CT scan to investigate your abdominal or bowel symptoms, especially if you would prefer not to have an invasive test.

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Benefits of a CT Scan

Detailed Images: A CT scan provides much more detailed images than regular X-rays, helping doctors better understand your condition.
Quick and Non-Invasive: The procedure is relatively quick and non-invasive, making it a useful tool for diagnosing and monitoring conditions.
Guides Treatment: CT scans help guide decisions about surgeries, biopsies, and treatments, including radiation therapy.

How Does a CT Scan Work?

Preparation:
Before your CT scan, your healthcare provider will explain the procedure and answer any questions. You may be asked to change into a hospital gown and remove any metal objects (like jewelry) that could interfere with the scan. If your scan involves contrast material, you might be asked to drink a special liquid or receive an injection to help make certain areas of your body (like blood vessels or organs) more visible.

During the Scan:

You will be asked to lie down on a table that slides into the CT scanner.
The scanner is a large, doughnut-shaped machine with a rotating X-ray beam inside. As the machine takes pictures, it will move around you in a circular motion.
The CT machine will take many pictures from different angles, and a computer will combine them to create detailed, cross-sectional images of your body.
You may be asked to hold your breath for a few seconds during the scan to reduce movement and get clearer images.
If contrast material was used, it will typically leave your body within a day or two, and you may be asked to drink extra fluids to help flush it out. You might feel a little warmth or have a metallic taste in your mouth for a short time after the contrast injection, but these effects are usually temporary.

Duration:
A CT scan usually takes about 10 to 30 minutes, depending on the area being scanned. You can usually go home right after the scan is finished.

CT Virtual Colonoscopy

An alternative to a colonscopy for bowel or abdominal symptoms is a CT virtual colonscopy.During a During this test, the patient undergoes a CT scan after their colon is inflated with air or carbon dioxide. The inflation helps to expand the colon and make the images clearer. The CT scanner then takes multiple X-ray images of the abdomen from different angles. These images are reconstructed into 3D images of the colon, allowing a radiologist to examine the colon’s interior for any abnormalities, such as polyps, tumors, or other signs of disease.

Advantages of CT Virtual Colonoscopy

Non-invasive: Unlike traditional colonoscopy, no scope is inserted into the body, making it a less invasive option. However, a small tube is still inserted through the anus to inflate the colon.
Quick and comfortable: The procedure typically takes about 10 to 20 minutes and may be more comfortable for some people, as there is no need for sedation or an extended recovery time.
Effective for detecting large polyps: CT colonography is effective at detecting larger polyps (those greater than 1 cm) and colorectal cancer, making it an excellent screening tool for individuals who cannot undergo a traditional colonoscopy.

Limitations and Considerations

Cannot remove polyps: If polyps or other abnormalities are found during a CT virtual colonoscopy, a traditional colonoscopy is then required to remove them or take biopsies.
Radiation exposure: CT scans involve a small amount of radiation, which may be a concern for some patients, especially if they need frequent screenings.
Preparation: Just like traditional colonoscopy, patients must undergo bowel preparation to clear the colon, which involves fasting and taking laxatives the day before the procedure.

What Should You Expect After the Scan?

Results:
After your scan, a radiologist (a doctor who specialises in medical imaging) will review the images and send a report to Mr Ferguson. He will then review this report and the scan pictures with you, discuss the results with you and explain any next steps.

Are There Any Risks?

A CT scan is generally safe, but there are some things to keep in mind:

Radiation Exposure:
CT scans use X-rays, which expose you to a small amount of radiation. While the risk is very low, Mr Ferguson will carefully consider whether the benefits of the scan outweigh the risks. If you are pregnant or think you may be pregnant, be sure to inform Mr Ferguson, as radiation can affect a developing baby.

Contrast Dye Reactions:
Some people may experience mild reactions to the contrast material, such as feeling warm, nauseous, or having a metallic taste in their mouth. Rarely, people may have allergic reactions. Be sure to inform Mr Ferguson if you have any allergies, especially to iodine or shellfish.