Before we begin: Doctors use CT scans (or CAT scans) to look for broken bones, cancers, blood clots, and more. Learn about the CT scan and what to expect during one.
This tutorial walks you through everything you need to know about ct scans. We explain it in plain language, step by step, so whether you are a student, a patient, or simply curious, you will come away with a solid understanding.
We cover what it is, why it matters, how it is diagnosed, and what you can do about it. Key facts are called out along the way.
What is a CT scan? Computed tomography (CT) is a type of medical imaging test that uses special x-ray equipment to make detailed pictures of the inside of your body.
A CT scan produces cross-sectional pictures, which are like slices of the body. These images show the size and structure of organs, bones, and other tissues. CT images can also be combined to create 3-dimensional (3D) views.
Health care providers use CT scans to diagnose, treat, and monitor many health conditions.
Who needs a CT scan? Your provider may suggest a CT scan for many reasons, including:
Fractures (broken bones)
Cancer
Tumors or masses
Blood clots
Signs of heart disease
Spinal conditions
Lung disease
CT scans may also be used to find the best place to perform a biopsy or help guide certain treatments. They may also be used to check for internal bleeding or injury after trauma or to evaluate the brain for certain conditions.
How do you prepare for a CT scan? You may be asked not to eat or drink for a few hours before the scan. Ask your provider if there are any special instructions to follow.
For some CT scans, you may receive a contrast material. Contrast helps certain parts of the body show up more clearly on the images. Depending on what area is being examined, contrast material might be given as:
A liquid to swallow
A shot (injection)
An enema (placed into the rectum)
CT scans use ionizing radiation at levels higher than a standard x-ray, but the amount is kept as low as possible. Always tell your provider if you are pregnant or think you may be pregnant.
How is a CT scan done? You may be asked to change clothes and remove jewelry or other items that could interfere with the scan.
During the scan, you lie still on a table. The table slowly passes through the center of a large donut-shaped machine. The x-ray tube rotates around your body to create images.
You may hear whirring sounds during the scan. You may be asked to hold your breath for short periods. The test is painless.
The scan usually takes a few minutes, but some may last up to 30 minutes, depending on the area being scanned.
What should you expect after a CT scan? Most people can return to normal activities right away. If you were given a contrast material, drinking fluids can help your body clear it.
A specialist called a radiologist reviews the images and shares the results with your provider.
NIH: National Cancer Institute
Also known as: CAT scan.
Related topics: CAT Scans.
Categories: Diagnostic Tests.
Key Takeaways
Understanding ct scans is an important part of taking charge of your health. Here is what to remember:
- Know the signs — Recognizing early symptoms can lead to earlier diagnosis and better outcomes.
- Talk to your provider — If you have concerns or a family history of this condition, bring it up at your next checkup.
- Stay informed — Medical knowledge evolves. Keep learning and asking questions.
- You are not alone — Many people deal with this condition. Support groups and educational resources can help.