Have you ever heard of a 'Virtual Colonoscopy'? Maybe your doctor suggested it to you, or maybe you read about it somewhere. Although the name sounds a bit like science fiction, this is actually a very important test that helps in early detection of cancer cells in our intestines, especially in the large intestine (colon). So, what is it, how is it done, and should you be afraid? We will talk about all this very simply today, in a way that you can understand.
What is a virtual colonoscopy? Simply put...
Simply put, a virtual colonoscopy, sometimes called a CT colonography, is a noninvasive way to look inside your colon. It uses a special CT scan machine and computer technology to take many high-resolution pictures of your colon. Like a 3D movie, the doctor can take a "virtual" tour of your colon. This allows them to look for polyps , small growths that could develop into colorectal cancer.
The best part is that this test doesn't require anesthesia and can be completed in as little as 15 minutes. However, if polyps are found during this test, you will need to have a traditional colonoscopy to remove them.
Virtual CT colonoscopy is one of the screening methods for colon cancer. Experts say that everyone should have this test after the age of 45. However, if you have certain risk factors, you may need to have it done earlier. Your doctor will explain to you whether this virtual colonoscopy is suitable for you or not.
How does this actually work?
It's very simple. A virtual colonoscopy uses imaging technology to take detailed pictures of your colon.
1. A technician will use a CT scanner (a machine that looks like a large doughnut) to take several pictures of your abdomen and pelvis.
2. Then, a computer processes these images and converts them into 2D and 3D images.
3. A radiologist will carefully study these images to see if there are any polyps or other abnormalities in your colon.
4. If such a thing is found, a regular colonoscopy will be required to remove the polyps.
How do we prepare before this test?
Before a virtual colonoscopy, you will need to have a "bowel preparation," or "prep" as some call it. This involves removing all of the stool/poop from your colon so that the doctor can see your colon and rectum clearly. This prep is often done the day before the test.
Your doctor will give you instructions on how to prepare for this. These instructions may include:
- Enemas: These are liquid medications that are inserted into your rectum. This stimulates bowel movements and makes it easier to pass stool.
- Laxatives: These come in liquid or powder form. When taken, they cause frequent bowel movements.
- Clear liquid diet: The day before the test, you will be able to drink only clear liquids, such as water, fat-free broth, apple juice, and unsweetened coffee or tea. Your doctor will give you a list of what you can eat and drink. You should follow this carefully.
- Fasting: You will not be able to eat or drink anything for a few hours before the test.
- Drinking a contrast medium: This is a special liquid that helps your colon to be seen clearly during a virtual colonoscopy.
Important: A complete bowel prep is essential for a successful virtual colonoscopy. You may experience frequent, watery diarrhea during this time. Therefore, it is best to stay home and near a bathroom that day.
What happens during the test? Is there anything to be afraid of?
On the day of the test, wear comfortable clothing and do not wear jewelry. A health worker will take you to the room where the CT scanner is located.
These are the steps that typically occur during a virtual colonoscopy:
1. After changing into a hospital gown, you will be made to lie down on an exam table.
2. The technician will insert a short tube , about 2 inches long, into your rectum. This tube will slowly inflate your colon. The colon will then expand and the images will be clearly visible on a CT scanner. This will be a little uncomfortable, but it will not be painful.
3. The table slowly takes you into the ``(CT scanner)``. It's like a small tunnel.
4. When the CT scanner takes pictures of your intestines, you may hear a "buzz... buzz..." or "click... click..." sound.
5. You will need to remain still while the CT scanner takes the images. The technician will talk to you through an intercom system. They may ask you to hold your breath for a few seconds, or ask you to change your body position.
6. When the test is over, the table will take you out of the scanner, and the technician will remove the tube from your anus, and then you can change clothes again.
This test is not painful. However, you may feel a slight pressure in your rectum or the need to pass gas. This is normal.
What are the advantages and disadvantages of this test?
Benefits:
- This can be completed in as little as 15 minutes .
- It can obtain 2D and 3D images that are as clear and detailed as those seen with a regular colonoscopy.
- Since you will not be given sedation, you will recover quickly .
- It is a less invasive test because doctors do not need to insert a scope into the intestine.
- There is less risk of damage to your colon than a regular colonoscopy.
- If for some reason you cannot have sedation or a regular colonoscopy, this is a good option.
- This can take pictures of your entire intestine, so it works well if you have a bowel obstruction or narrowed parts of your intestine.
- Also, it can sometimes show problems with your kidneys, liver, or other parts of your abdomen.
Risks and limitations:
- When air enters the intestines, it can rarely cause bowel perforation (this is very rare).
- There is exposure to small amounts of radiation (exposure levels are safe).
- Smaller polyps that can be caught with a regular colonoscopy may be missed .
This test may not be safe for everyone, which is why the doctor will carefully review your medical history and any medications you are taking beforehand.
What to expect after the test?
After a virtual colonoscopy, you can return to your normal activities, eating and drinking as usual. Since anesthesia is not required, recovery time after a virtual colonoscopy is minimal, if any.
However, you may experience some minor side effects. For example, excess gas may be released due to flatulence. This gas may cause some cramping or bloating. However, these are normal and will subside after a while.
What do the results of this test really say?
- If an abnormality or polyp is found:
This does not mean that you have colorectal cancer. However, you will definitely need to have a follow-up colonoscopy to remove the polyp. Sometimes, because you are already prepped, you can have the test done on the same day.
- If problems are found in other organs outside the intestine:
Because a virtual colonoscopy can also provide a rough idea of other organs in your pelvis, it can sometimes detect problems outside of your colon. If that's the case, your doctor will order additional testing for those organs.
- If the results are normal:
This means that the doctor did not see anything unusual in your colon. Ask your doctor when you should have your next colorectal cancer screening. If you are at low risk for colon cancer, you may be asked to have a virtual colonoscopy again, about every five years.
How accurate are these results?
Several studies have shown that virtual colonoscopy is nearly as effective at detecting large polyps and cancer as a traditional colonoscopy. However, this accuracy can vary depending on the size of the polyps. It is generally more accurate at detecting polyps larger than 10 millimeters. It is less effective at detecting polyps smaller than 6 millimeters.
When should I see a doctor immediately?
After a virtual colonoscopy, you should seek medical advice immediately if you experience any of these symptoms:
- If you have blood in your stool, or if you have bleeding from your butthole/rectum.
- If you feel dizzy.
- If you have a fever.
- If you have severe abdominal pain.
Finally, the most important thing you need to remember! (Take-Home Message)
Colorectal cancer is one of the most common types of cancer among adults. But the good news is that this cancer is very easy to treat if it is detected early. That's why screening tests are available.
However, many people are hesitant to undergo a routine colonoscopy. This may be due to the preparation, anesthesia, or fear of the procedure.
Virtual colonoscopy is a good option for such people. It has a lower risk of complications and a faster recovery.
So, talk to your doctor about which colon cancer screening method is right for you. Then you can know whether a virtual colonoscopy is right for you. Don't be afraid or hesitant to ask your doctor about this. You are the one who makes the decisions about your health!
` Virtual Colonoscopy, CT Colonography, Colon Cancer, Polyps, Bowel Exam, Cancer Screening, Virtual Colonoscopy
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