CT Scans

What is a CT scan?

A CT (Computerized Tomography) scan, uses X-rays to produce images of your body, which shows your internal structures in cross sectional images. CT scanners use an X-Ray unit that rotates around your body along with a powerful computer. The final result with a CT scan is a set of cross sectional images (an example of slices in a loaf of bread is often used) of the inside of your body.

CT scans are done to help diagnose bone disorders, pinpoint the location of a tumor, infection or blood clot, detect and monitor medical problems such as cancer, heart and lung diseases and the growth of pulmonary nodules, detect internal injuries and internal bleeding and much more.

How can I prepare for this test?

We recommend that CT scans be scheduled in advance whenever possible. Some insurance companies need to be notified before the scan can be done. If an IV contrast is ordered and you:

• Have an iodine allergy or have had a reaction to IV contrast in the past; you need to notify your physician and a premedication may be ordered for you.
• Are a diabetic or over the age of 70; you need to have a blood test to ensure your kidneys are functioning properly.

Other preparations for CT scans vary depending on the area being examined. These preparations may include drinking barium, along with dietary restrictions prior to your scan. If you are pregnant or suspect you might be, inform your physician. Your doctor may suggest postponing the procedure or choosing an alternate exam that doesn't use radiation.

How is the scan done?

A history sheet needs to be filled out prior to the scan, which will provide us with the needed information to give you the best diagnostic test possible. During a CT scan, you lie on a table inside a doughnut-shaped machine. You will not be closed in, and will be able to see around you. An X-ray tube inside the machine rotates around your body and sends small doses of radiation through it at various angles. A computer gathers the signals that are passed through your body and converts them into a computer image, which is displayed on the monitor. As you are lying on the table, the table will be sliding through the doughnut shaped machine. While the table is moving, you must hold still, and you may be given instructions to hold your breath or not to swallow. You may hear a whirring noise.

During this time the technologist goes in the control room. There is a large window to observe you and an intercom to communicate to you and hear you. While in this room the technologist also monitors your images coming up on the computer screen.

CT scans are painless. If you are getting IV contrast, there will be the pain that accompanies a needle stick. During the injection, you may feel warm and flushed, feel like you are urinating (but you won't be), and may get a metallic taste in your mouth. You may feel nothing at all, but these are normal effects and they last only a minute.

After the scan you can resume your normal activities. If you were given an IV contrast, you should drink more fluids to flush the contrast from your kidneys. The oral contrast is nondigestable, therefore it will come out naturally - no laxatives are necessary.

How long does the test take?

The length of the test depends on the area being examined and the specific information requested by your doctor. The average scan takes about 5 minutes.

How are the results used?

Immediately following your scan the images will be transmitted to the Radiologist for an interpretation. A report will be generated and sent to your physician shortly afterwards. Your physician will call you with the results.

What else do I need to know?

If you are having an injection with your scan and are a diabetic on Metformin or Glucophage, please inform your doctor. He may want you to discontinue these medications for 48 hours after the test and may want a blood test before starting back on these medications. CT scans can be done even if you have a pacemaker or internal defibrillator.

If you would like to learn more about CT scans, or schedule an appointment, please call 219-922-3009.