During the scan, a beam of X-rays is focused on a specific part of your body, such as the spleen, kidneys, or spine. The X-ray tube moves rapidly around this site enabling multiple images to be made from different angles to create a cross-sectional image. An electronic detector records information from the X-ray beam and feeds it to a computer where the image is processed and displayed on a screen. During some CT scans, a contrast medium (commonly called a "dye") is used to outline blood vessels or add contrast to organs so they can be seen more clearly by the scanner.

When you arrive for your appointment you will be asked to undress, put on a hospital gown, and remove jewelry, dentures, or any other objects that might interfere with the X-ray procedure.

If a contrast agent is needed, a preliminary set of scans may be done before the agent is introduced. Depending on the part of your body being examined, the agent may be given by mouth or injection into a vein. In some cases, additional scans will be obtained after the contrast agent is introduced.

Plan to arrive at least 30 minutes before your scheduled time. This will allow time for any paper work and for changing into your examination gown.

You will be left alone in the room while the exam is performed. We will watch you every second through the entire exam and you can let us know if you feel any discomfort. We can hear you and see you through our window very well.

During the exam, the table will start to move and make a sound as the positioning motor runs. This is a normal process that moves you a short distance every few seconds. It positions the couch so that a slightly different view can be scanned until all of the views required for your exam have been taken.

The technologist may ask to hold your breath for a short time as each scan is made. Most of the time, you can just relax.