CT Virtual Colonoscopy, also known as CT Colonography, is a minimally invasive medical imaging procedure that uses low-dose radiation CT scanning to obtain an interior view of the colon (the large intestine) and rectum. This procedure is used to detect polyps, cancers, and other diseases of the colon. It is considered a 'virtual' colonoscopy because it enables physicians to 'navigate' through the colon in a way that resembles a traditional colonoscopy, but without the need for a long flexible tube to be inserted into the rectum.
Note: Home Sample Collection is only for Pathology lab tests.
Preparation : The accuracy of a CT Virtual Colonoscopy heavily depends on a clean colon. Therefore, patients are required to follow a specific diet and take laxatives or enemas before the procedure. This typically involves a clear liquid diet the day before the procedure and the use of a strong laxative to cleanse the colon.
Medications : You should inform your doctor about any medications you're currently taking, especially if you're diabetic or have heart conditions, as some preparation medicines may affect these conditions.
Allergies : Notify your doctor if you have allergies, particularly to contrast material or iodine which may be used in some cases.
Pregnancy : The procedure involves exposure to radiation which can be harmful to an unborn baby. Inform your doctor if you are or might be pregnant.
Clothing : You should wear comfortable, loose-fitting clothing for your test. Metal objects can affect the CT images and should be removed.
Procedure : During the procedure, you will lie on a narrow table that slides through the CT scanner. A small tube will be inserted a short way into your rectum to gently inflate your colon with air or carbon dioxide to provide a clearer view. You may be asked to change positions during the test to obtain different views of the colon.
Normal activities : Most people can return to normal activities immediately after the procedure.
Results : Your doctor will interpret the results of your CT Virtual Colonoscopy and discuss them with you at a later appointment.
While both tests are designed to view the colon, a traditional colonoscopy involves inserting a long flexible tube (colonoscope) into the rectum and up into the colon. A CT Virtual Colonoscopy uses CT Scanning to produce a series of detailed images of the colon and does not require the insertion of a colonoscope.
The actual scanning time usually takes less than 15 minutes. However, the whole procedure, including preparation and aftercare, may take about 2 hours.
While the procedure is generally not painful, some discomfort may be felt when the tube is inserted into your rectum and your colon is inflated. This can cause a feeling of fullness or cramping.
The American Cancer Society recommends that adults aged 45 and older with an average risk of colorectal cancer should undergo regular screenings. CT Virtual Colonoscopyis usually performed every five years, but the frequency can vary depending on your personal risk factors and your doctor's recommendations.
CT Virtual Colonoscopy exposes you to a small amount of radiation. Although the risk is minimal, exposure can increase the risk of cancer over time, particularly with repeated tests. Also, there's a very small risk that inflating the colon could injure or perforate it.
If the CT Virtual Colonoscopy reveals polyps or other abnormalities, you may need a traditional colonoscopy to remove the polyps or take tissue samples.
If you have a history of polyps or colorectal cancer, your doctor may recommend a traditional colonoscopy because it allows for both detection and removal of polyps during the same procedure.
CT Virtual Colonoscopy is less invasive than a traditional colonoscopy and doesn't require sedation, so you can return to your normal activities immediately after the procedure. The procedure is also quicker and may be a more comfortable alternative for some people.
Coverage for CT Virtual Colonoscopy varies by insurance company and policy. It's best to check with your insurance provider to understand your coverage.
If your results are abnormal, your doctor will guide you about the next steps. Depending on the findings, you may be referred to a gastroenterologist for further investigation and treatment.
Through innovations like the CT Virtual Colonoscopy, the medical field continues to advance, offering patients less invasive and more comfortable options for necessary procedures. Understanding these processes can make the experience less daunting and more manageable, allowing you to take an active role in your health. If you are due for a colon screening, speak with your doctor about whether a CT Virtual Colonoscopy might be the right option for you.