A computed tomography (CT) scan is an imaging test that produces cross-sectional images of structures inside the body. It offers more detail than standard X-rays, and providers use it to examine bones, organs, blood vessels, and soft tissue. Here’s information about what a CT scan involves and when to get one:
Understanding CT Scan Basics
A CT scanner takes a series of X-ray images from multiple angles, and a computer processes them into layered “slices” of the body. Providers can also combine these slices to produce three-dimensional views of a specific area, which gives them a clearer picture of what they are examining. The machine itself is a large, ring-shaped unit with a motorized table that moves through the center opening. Some scans require contrast material, a special dye that makes certain tissues and blood vessels stand out more clearly. Depending on the area under examination, you may receive contrast by mouth, through an IV, or both. Your provider will specify which method applies to your scan.
Recognizing Key Reasons for Scanning
Healthcare providers review symptoms, medical histories, and physical exam findings before recommending any imaging. They determine whether a CT scan fits your specific situation. Reasons providers may order CT imaging include:
- Trauma: After car accidents or serious falls, providers use CT imaging to check for broken bones or internal bleeding.
- Suspected internal injuries: CT scans let providers examine organs such as the liver, spleen, and kidneys when an injury is not visible externally.
- Head injuries: After a significant blow to the head, providers may order a head CT to check for skull fractures, bleeding, or swelling.
- Spinal concerns: CT imaging offers detailed views of the vertebrae, which helps providers evaluate fractures, alignment, and structural changes.
- Abdominal symptoms: Providers may use CT imaging to investigate appendicitis, kidney stones, or bowel problems when other tests leave questions unanswered.
- Treatment planning: CT scans help guide procedures like biopsies or monitor changes in a known condition over time.
In emergency settings, providers may choose CT imaging because it delivers results quickly, making it a practical tool when time matters.
Preparing for an Appointment
Preparation steps vary by scan type; your provider or imaging center will give you instructions specific to your situation. If your scan uses IV contrast, you may need to stop eating or drinking a few hours beforehand. On the day of your scan, wear loose clothing without metal zippers, and leave jewelry at home. Metal objects may interfere with the images.
During the appointment, a radiologic technologist guides you through each step of the procedure. You lie on the table, usually on your back, and the technologist may use pillows or straps to help you stay still. Movement sometimes results in blurred images. If the scan requires IV contrast, the technologist places a small line in your arm before the procedure begins. The table then slides slowly into the scanner while the technologist operates the machine from a nearby room. You may hear buzzing or whirring sounds during the scan. A radiologist then reviews the images and sends a report to your provider.
Learn More About CT Scans
CT imaging enables providers to evaluate trauma, spinal concerns, head injuries, and abdominal issues. They may order a scan after a fall or car accident or to investigate conditions such as brain tumors and other internal abnormalities; knowing what to expect helps you arrive prepared. Talk with your healthcare provider to learn whether a CT scan is the right next step for your care.
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