About Extremity CT
CT imaging is valuable in diagnosing problems of the extremities because it yields detailed information about bones and joints. It is used commonly following an arthrogram, which involves injecting a contrast material into the joint, usually to look for a tear in the cartilage. CT images can be manipulated on the computer to provide the RAS radiologist detailed views from several directions.

What to expect
You will lie comfortably on your back on a padded table that moves through the scanner, which looks like a large square with an opening in the middle. Both ends of the scanner are open; you are not enclosed. For most exams you will lie on your back, but for certain exams you must lie on your stomach. You will be able to communicate with the technologist at any time through a two-way intercom.

As the procedure begins, you will hear humming, buzzing or clicking sounds from the CT machine. The table will move in short steps through the scanner as the CT tube rotates around you. At each step, the scanner completes a separate view. The information is processed by the computer and displayed as images on a video screen for the technologist.

You should remain as still as possible to produce the clearest images. For some exams you may be asked to hold your breath during the imaging. If contrast material is injected into a vein in your arm, you may notice a warm, flushed sensation and a metallic taste in your mouth for a short time.

The CT scan itself causes no pain. Usually the scanning takes several seconds or just a few minutes to perform. You can expect to be in the department for 15 to 60 minutes, depending on the area being scanned. When we schedule your appointment, we can give you an estimate of how long your procedure will take.

If your exam requires a joint injection prior to the CT, that will be done in another suite and you will receive specific instructions for that procedure.

A RAS radiologist will interpret your CT scan and report the results to your physician within five working days.

Patient preparation
You should wear comfortable, loose-fitting clothing for your CT exam. You maybe asked to remove earrings, eyeglasses, and clothing containing metal that could interfere with imaging of the area being scanned. You may be asked to change into a gown.

If you are having a scan that requires intravenous (IV) contrast media, you will be given specific instructions for preparation.

Before the exam begins, please tell your physician and the technologist if you may be pregnant. We will advise you about any dietary restrictions when scheduling your appointment. You may continue to take prescribed medications prior to your exam.

Side effects and complications
CT scanning causes no side effects. CT does involve exposure to X-ray radiation, but the benefit of an accurate diagnosis far outweighs the risk.

Serious allergic reaction to the iodine-based contrast medium is rare. Our CT staff is well equipped to administer emergency treatment if necessary. Please let us know if you know or think you may be allergic to iodine.

Nursing mothers should wait 24 hours after contrast injection before resuming breast-feeding.

Follow-up care
The CT exam itself requires no follow-up care. If you had a joint injection, you will receive specific instructions from the staff.