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Computed Tomography (CT)
Computed Tomography (CT) is a noninvasive, painless medical test that uses a rotating X-ray tube and detectors to generate cross sectional images or ‘slices’ of the patient. The data from the scan can be displayed to show bones, soft tissues or organs, or blood vessels. Radiologists can more easily diagnose problems such as cancers, cardiovascular disease, infectious disease, trauma and musculoskeletal disorders. The most common exams include brain, spine, chest, abdomen and pelvis studies.
How to Prepare
| 1. Patients requiring intravenous contrast for CT exams should not eat or drink at least 4 hours prior to the procedure; check with your physician if there is a twelve hour fast. |
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| 2. Wear comfortable, loose-fitting clothing. You will need to remove all clothing and jewelry in the area to be examined. | |
| 3. Women should always inform their physician or technologist if there is any possibility that they are pregnant. | |
| 4. Report to your physician all medications that you are taking, including herbal supplements. | |
| 5. Report to your physician any allergies you may have, especially to anesthesia or to contrast materials. | |
| 6. Check with your physician if you are on blood thinners (Coumadin, Warfarin). You may need to stop your medication and/or have blood coagulation tests within normal values prior to the procedure. | |
| 7. Check with your primary physician if you are taking Insulin. The morning dose on the day of the procedure may need to be adjusted because of skipping breakfast. |
What to Expect
The technologist begins by positioning you on the CT examination table, usually lying flat on your back or possibly on your side or stomach. Straps and pillows may be used to help you maintain the correct position and to hold still during the exam. If you have difficulty staying still, or are claustrophobic, you may be a little stressed. A mild sedative may be offered to help ease the tension. If a contrast material is used, it will be swallowed, injected through an IV or administered by enema, depending on the type of examination. Next, the table will move quickly through the scanner to determine the correct starting position for the scans. You will hear slight buzzing, clicking and whirring sounds as the CT scanner revolves around you. The table will then move slowly through the machine as the actual CT scanning is performed. You may be asked to hold your breath during the scanning. You will be alone in the exam room during the scan, but the technologist can see, hear and speak to you at all times. When the examination is completed, you will be asked to wait until the technologist determines that the images are of high enough quality for the radiologist to read. CT scanning of the body usually lasts between 5 and 30 minutes. After the CT scan, you can return to normal activities. If you received a contrast material, you may be given special instructions.
For more information about Computed Tomography (CT), please visit www.radiologyinfo.org.
