When a doctor tells you to have a CT scan (Computed Tomography), you might be a little scared and curious, right? It's normal for questions like "What is it? Will it hurt? Why is it being done?" to come to mind. So today, we'll talk about what a CT scan is, what happens with it, and how we should prepare for it in a simple, understandable way.
What exactly is a CT scan?
Simply put, a CT scan is like an X-ray, and it's used to look at the inside of your body. However, a regular X-ray only gives you a flat picture taken from one side. In a CT scan, a special machine rotates around you and takes hundreds of X-ray pictures from different angles. A computer then combines all these pictures to create a three-dimensional (3D) view of your body, including organs and bones.
Imagine, if you look at a regular chest X-ray, things like the lungs and heart appear to be overlapping. But with a CT scan, you can see each of these organs separately and very clearly. Some people also call this a CAT scan. CT stands for `(Computed Tomography)`, and CAT stands for `(Computed Axial Tomography)`. Either way, these are the same test.
What can we see with a CT scan?
A CT scan can clearly see the following parts of your body:
- Bones (bones)
- Muscles
- Internal organs (like lungs, heart, liver, kidneys)
- Blood vessels (blood veins)
What kind of diseases can a CT scan help diagnose?
CT scans are very helpful for doctors in diagnosing various diseases and injuries. Here are a few examples:
- Some types of cancer and non-cancerous tumors (Benign tumors)
- Fractures (broken bones, sprains)
- Heart disease
- Blood clots
- Intestinal diseases (e.g., `(Appendicitis)`, `(Diverticulitis)`, intestinal obstructions, `(Crohn's disease)`)
- Kidney stones
- Injuries to the brain (such as a head injury)
- Spinal cord injuries (spinal cord injuries)
- Internal bleeding
Imagine that you suddenly fall and hit your head hard. Then the doctor might want to know exactly if there is any bleeding or swelling inside the head. That's when a CT scan becomes very important.
How should we prepare before a CT scan?
Your doctor will explain everything you need to know before you have a CT scan, but this is what usually happens:
- Plan to arrive a little earlier than your scheduled appointment. The doctor will tell you what time to arrive.
- Do not eat anything for four hours before the CT scan.
- Drink only clear liquids such as water, tea, and fruit juice (filtered) for two hours before the scan.
- Wear comfortable clothing. Remove metal jewelry (such as earrings, necklaces, rings) and clothing with metal. The hospital may give you a special garment to wear.
What is a CT scan with contrast? (CT Scan with Contrast)
Sometimes, a special liquid (like a medicine) is used to make certain parts of the body, organs, or blood vessels seen on a CT scan more clearly. This is called `(Contrast material)` . It can be given in two ways:
1. Intravenous (IV): This liquid is injected into a vein through a cannula, just like saline.
2. Oral contrast: Sometimes, especially when examining parts of the body such as the intestines, you are given a liquid to drink (for example, a barium swallow).
This `(Contrast material)` allows doctors to see certain tissues, organs, and blood vessels very clearly. It makes it easier to diagnose diseases. `(IV contrast)`, which is given intravenously, is usually excreted from the body when you urinate within 24 hours.
Additional preparations for CT with contrast:
If you are having a CT scan using contrast material, you will need to be aware of a few additional things:
- Blood test: You may be asked to have a blood test before your CT scan. Make sure your doctor knows if it is safe for you to have the contrast material.
- Food and drink restrictions: To prevent nausea and vomiting while the contrast material is being administered, you will be asked to drink only clear liquids for four hours before the scan. Examples: soup broth (without oil), tea (only green), coffee (without milk and sugar), well-filtered fruit juice, gelatin, and some clear, sweetened beverages (such as ginger ale).
- Allergy medication: If you have an allergy to the contrast material used for a CT scan (which contains iodine), that is, if you have had an allergic reaction to something similar in the past, your doctor may give you special medications (such as steroids and antihistamines) to take the night before the scan and the morning of the scan. You should talk to your doctor about this and get a prescription for them. (There are two types of contrast agents used for MRI scans and one used for CT scans. Being allergic to one does not mean you are allergic to the other.)
- Contrast fluid: If you are given a contrast fluid to drink , you should drink it exactly as the doctor tells you, and at the time you are told.
What happens during a CT scan?
During the test, you will usually lie down on a bed-like surface (`(Table)`). If your test requires `(Contrast material)`, a healthcare worker will inject the medicine into your vein at that time. Some people may feel a slight warmth or a metallic taste in their mouth when the `(Contrast)` is given. This is normal, don't worry.
When the scan starts, this is what happens:
- A large donut-shaped machine (`(Doughnut-shaped scanner)`) goes into the bed you are in.
- During this time, you should remain as still as possible, as moving can cause the pictures to be blurry.
- Sometimes you'll be asked to hold your breath for a short period of time, usually for a short period of time, like 15-20 seconds.
- The machine takes pictures of the part of the body the doctor wants to see. Unlike an MRI scan (Magnetic Resonance Imaging scan), a CT scan doesn't make a lot of noise, it's quiet.
- When the test is finished, the bed comes back out of the machine.
How long does a CT scan take?
A CT scan usually takes about an hour. But most of that time is spent preparing. The actual scan itself takes less than 10 or 15 minutes. Once the doctor gives you the okay – meaning after the scan is complete and the images are in good quality – you can go about your normal business.
Are there any side effects from a CT scan?
The CT scan itself does not usually cause major side effects. However, some people may experience minor side effects from the contrast material. For example:
- Nausea and vomiting
- Headache
- Dizziness
These usually get better after a while.
When will we know the results of the CT scan?
It usually takes between 24 and 48 hours to get the results of your CT scan. A radiologist (a doctor who specializes in CT scans and other X-rays) will look at your scan images and write a report about what they found. However, in an emergency, such as in a hospital or emergency room, doctors may get the results in as little as an hour.
After the radiologist and your doctor review the results, they will either give you another appointment or call you to discuss the details.
Is a CT scan safe?
Doctors say that CT scans are largely safe . CT scans are also safe for young children. When they are done on children, doctors reduce the dose to reduce the amount of radiation they are exposed to.
Like X-rays, CT scans use small amounts of ionizing radiation to take pictures. Here are some of the risks associated with this radiation:
- Cancer risk: Tests that use radiation, such as X-rays and CT scans, theoretically may increase the risk of developing cancer slightly. But the difference is so small that it's difficult to measure it accurately.
- Allergic reactions: Sometimes, you can have an allergic reaction to the contrast material. This can be minor or it can be serious. That's why we ask if you've had any allergies before.
If you have any questions or concerns about the health risks of a CT scan, talk to your doctor about it openly. They can explain it to you and help you make an informed decision.
Can I have a CT scan if I am pregnant?
If you are pregnant, or think you may be pregnant, you should definitely tell your doctor. CT scans of your pelvis and abdomen may expose your unborn baby to some radiation. However, the amount is usually not high enough to harm the baby. Also, CT scans of other parts of your body (e.g., head, chest) do not pose any risk to the unborn baby. However, it is best to talk to your doctor about this and get advice.
Finally, a few things to remember (Take-Home Message)
It's normal to feel a little nervous and anxious when your doctor tells you to have a CT scan (Computed Tomography). But remember, a CT scan is:
- A painless test.
- The risk is very low.
- It is of great help to doctors in diagnosing many different medical conditions.
Getting an accurate diagnosis will help your doctor decide the best treatment for you. So, don't be afraid to talk to your doctor about any questions or concerns you may have. Also, ask about other possible tests. Then you can have a clear understanding of this.
` CT scan, computed tomography, radiation, X-ray, diagnosis, contrast material, health tests
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