CT Scan
A CT scan also called CT or computerized tomography is an X-ray technique that produces images of your body that visualize internal structures in cross section rather than the overlapping images typically produced by conventional X-ray exams.
Conventional X-ray exams use a stationary X-ray machine to focus radiation on a particular area of the body to produce 2-D images much like a photograph. CT scans use an X-ray that rotates around your body and a powerful computer to create cross section images, like slices, of the inside of our body.
Your doctor may recommend a CT scan to help:
- Diagnose muscle and bone disorders, such as bone tumors
- Pinpoint the location of a tumor, infection or blood clot
- Detect and monitor diseases such as cancer or heart disease
During a CT scan, you lie on a table inside a doughnut-shaped machine called a gantry. An X-ray tube inside the machine rotates around your body and sends small doses of radiation through it at various angles. As X-rays pass through your body different tissues absorb different amounts of radiation. The computer then assembles the images and displays them on a computer monitor.

You can expect a CT scan to last from 30 minutes up to an hour, depending on the preparation needed and whether it includes the use of a contrast medium. After the exam you can return to your normal routine. If you are given a contrast medium our technologist performing the scan may give you special instructions. You may be asked to wait a short time in the department to ensure that you feel well after the exam.
CT images are stored as electronic data files and usually reviewed on a computer. A radiologist interprets these images and sends a report to your doctor.
Be sure to inform your doctor if:
- You are pregnant
- You have asthma or allergies. There is an increased risk of a reaction to the contrast medium
- You have certain medical conditions: diabetes, asthma, heart disease, kidney problems or certain thyroid conditions may increase your risk of a reaction to contrast medium.
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