Virtual Colonoscopy: A Painless Way to Check for Colon Cancer

If you're due for a colon cancer screening, you may have heard about virtual colonoscopy. This non-invasive test, also known as CT colonography, uses X-rays and a CT scanner to create detailed images of your rectum and colon (large intestine). It's a quick and painless way for doctors to check for small growths called polyps and signs of colorectal cancer.

How Virtual Colonoscopy Differs from Regular Colonoscopy

During a regular colonoscopy, you're given medication to help you relax, and a doctor inserts a thin, flexible tube with a camera into your rectum to examine the lining of your colon. If any polyps or suspicious tissue are found, the doctor can remove them for testing during the same procedure.

With virtual colonoscopy, there's no need for a camera-equipped tube or sedation. Instead, you lie on a table that slides into a CT scanner, which uses X-rays to create 3D images of your colon. The doctor then reviews these images on a computer screen to look for polyps or other abnormalities.

Preparing for a Virtual Colonoscopy

As with a regular colonoscopy, you'll need to clean out your colon before the test. This typically involves:

• Following a special diet for a few days

• Taking a laxative to clear out your bowels

• Drinking a contrast liquid that helps highlight your colon on the CT images

Be sure to tell your doctor about all the medications you take, including over-the-counter drugs, vitamins, and supplements. You may need to temporarily stop taking certain medicines before the test.

What to Expect During the Procedure

A trained technician will perform your virtual colonoscopy, which usually takes about 10 to 15 minutes. You'll lie on your side on a narrow table while the technician inserts a thin tube into your rectum to inflate your colon with air. This helps create clearer images, but it may cause temporary bloating and discomfort.

Once your colon is inflated, the table will slide into the CT scanner. The technician will leave the room but will be able to communicate with you throughout the test. You may be asked to hold your breath or turn at certain points to help get the best possible images.

Recovery and Results

After the test, you can return to your normal diet and activities right away. You may feel some bloating and pass gas as your body expels the air from your colon. Your doctor will let you know when to expect your test results and discuss any necessary follow-up steps.

Pros and Cons of Virtual Colonoscopy

While virtual colonoscopy offers several benefits, it's not right for everyone. Here are some pros and cons to consider:

Pros:

• Lower risk of complications compared to regular colonoscopy

• No sedation required, making it a good option for older adults or those taking blood thinners

• Quick procedure with no recovery time needed

• Generally less expensive than regular colonoscopy

Cons:

• Small polyps or abnormalities may be missed since the doctor isn't directly viewing the colon

• Not always covered by insurance

• Involves a low dose of radiation exposure

• If polyps or suspicious tissue are found, you'll need to have a regular colonoscopy to remove and test them

Talk to your doctor to see if virtual colonoscopy is right for you. And remember, the best way to prevent colon cancer is to get screened regularly, eat a healthy diet, and exercise often.

For more information on virtual colonoscopy and other colon cancer screening options, visit the American Cancer Society website.