Health Services

Computed Tomography (CT) Scan

What is a CT scan?

A CT scan is the process of creating cross-sectional images of any part of the body. During the examination, a thin X-ray beam is used to scan the area of body part being examined. The beam scans a small portion of the body at a time. A computer then reconstructs the data creating two-dimensional X-ray images or "slices."

CT examinations compliment other imaging examinations, such as X-ray films, by offering physicians an additional tool in which to view anatomy. In some cases, CT provides diagnostic information that cannot be achieved with any other method.

The procedure

The technologist will bring you into the CT scan room where the procedure will be explained to you. The technologist will help you onto the cushioned table.

To obtain the best possible images, it is important that you lie very still during the examination. As the procedure begins, you will hear a whirring sound as the X-ray tube moves within the machine. The table will move slightly as each picture is taken.

Depending on the type of examination you are having, you may be given an injection of contrast material (X-ray dye). Sometimes scans are performed before receiving X-ray dye and then repeated after the dye is given. In either case, the technologist will explain each step of the examination.

The technologist will communicate with you during your examination through a microphone. You may be given breathing instructions during your examination. If you are having a biopsy during your CT scan, you will be asked to sign a permission form.

Preparation

•	Wear loose, comfortable clothing.
•	Do not eat or drink anything for three hours before your examination. If you take medications, ask your physician if you should take them before your CT scan. Any medication should be taken with a small sip of water.
•	If you are receiving IV X-ray dye and are allergic to any medications or have had a previous allergic reaction to X-ray dye, please tell your physician, the radiologist or the technologist.
•	If you are having an examination of your abdomen or pelvis, you will be given an orange-flavored drink to outline your intestines and stomach.
•	There is generally no preparation required for spine CT examinations.

After the procedure

Occasionally, additional information is needed. You may be asked to lie on the table again for more scans. The radiologist will review the images from your CT scan and provide a detailed report to your physician. Your physician will discuss these results with you and explain what they mean.

Note to female patients: If you are pregnant or think you may be, let your physician know before proceeding with the CT scan.