Computed Tomography (CT) Imaging

Procedure Overview:

During a CT scan, a special X-ray machine rotates around your body, capturing multiple cross-sectional images (slices) from different angles. These images are then reconstructed by a computer to create detailed, three-dimensional representations of the scanned area. The resulting images provide valuable information to doctors for diagnosis and treatment planning.

What to Expect:

Preparation: 

You will be requested to change into a hospital gown and take off any metal items, including jewelry or accessories, that might interfere with the imaging, depending on the part of your body that is being scanned. If contrast dye will be used during the scan, you might also need to fast for a few hours beforehand.

Contrast dye: 

A contrast dye can sometimes be used to make particular structures and tissues more visible. The contrast can be given intravenously, orally, or in various ways. If contrast dye is used, you can feel warm or taste something metallic after the injection.

Imaging procedure:

You will lie on a moveable table that glides into the CT scanner for the scan. The radiographer will place you properly and make sure you’re at ease. The CT scanner itself has the appearance of a sizable doughnut-shaped device. While you are inside, it will move about you while taking pictures. To reduce motion artifacts in the images, you will be requested to hold your breath for a brief period of time while lying still during the scan.

Duration of imaging procedure:

The actual scan just takes a few minutes on average, so it is fairly quick. However, it’s possible that the entire procedure—including setup and positioning—will take between 15 and 30 minutes.

Safety Considerations:

CT scans involve exposure to a higher dose of X-ray radiation compared to standard X-rays. However, modern CT machines are designed to minimize radiation exposure as much as possible while still providing high-quality images. The benefits of the diagnostic information obtained from a CT scan generally outweigh the risks associated with radiation exposure.

(Mayo Clinic, 2022)