This article will help you understand the CT scan protocol and how to prepare for it.
What Is a CT Scan?
Computed Tomography (CT) combines a series of X-ray images taken from different angles around your body and uses computer processing to create cross-sectional (slices) images of the bones, blood vessels, and soft tissues inside your body. CT images provide more detailed information than standard X-rays.
A special dye called contrast material may be needed for some CT scans to help highlight the areas of your body being examined. The contrast material blocks X-rays and appears white on the images, which can help emphasize blood vessels, intestines, or other structures.
Patients may receive the contrast material:
- Orally: If examining the esophagus or stomach, the patient receives a liquid containing contrast material to drink.
- Injection: The contrast agent may be injected through a vein in the arm to help the gallbladder, urinary tract, liver, or blood vessels stand out in the images.
- Enema: The contrast material may be inserted into the rectum to help visualize the intestines. This procedure may cause the patient to feel bloated and uncomfortable.
When Is a CT Scan Needed?
CT scanning has many uses. A doctor may recommend a CT scan to help:
- Examine internal inflammations, such as appendicitis and colitis.
- Examine the urinary tract if stones are suspected.
- Diagnose muscle and bone disorders, such as bone tumors and fractures.
- Locate a tumor, infection, or blood clot.
- Guide procedures such as surgery, biopsy, and radiation therapy.
- Detect and monitor diseases and conditions like cancer, heart disease, lung nodules, and liver masses.
- Monitor the effectiveness of certain treatments, such as cancer treatment.
- Detect internal injuries and internal bleeding.
How to Prepare for a CT Scan?
Depending on which part of your body is being examined, you may be asked to:
- Change your clothes and wear hospital attire.
- Remove metal objects, such as belts, jewelry, dentures, and glasses, which might interfere with the image results.
- Refrain from eating or drinking for several hours prior to the scan if required.
- If your infant or child is undergoing a CT scan, the doctor may recommend a sedative to keep your child calm and still. Movement can blur the images and potentially lead to inaccurate results. Ask your doctor about how to prepare your child.
