Computed tomography (CT or CAT scan)

A CAT scan uses computerized X-ray technology to create detailed images of the inside of your body. The equipment uses a computer to take many cross-sectional images of your body. The computer assembles these images to produce 3D images of the organs and other tissues in the areas that have been scanned. Sometimes contrast materials are used to enhance the quality of images.

The CT scan provides a detailed view inside the body's organs and tissues, so it can be used to identify sources of internal pain, diagnose internal growths and tumors, detect blood clots, and detect spinal injuries or disk problems in the spinal column. A CT scan may be used to help localize radiation treatment for cancer and help surgeons prepare for surgery by providing a look inside the area where the procedure will be performed.

Preparation may vary slightly depending on the area of the body being examined. Some individuals undergoing a CT examination must complete a four-hour fast prior to the test. Low osmolar (or non-ionic) contrast dye is often used during the exam and the four-hour fast helps ensure the best quality test results. You should, however, continue taking all medications as prescribed by your physician.

Wear comfortable clothing with no metal. Bring your physician's orders, insurance card and picture I.D. with you. Family members are invited to stay in our waiting area for the duration of your procedure

Please note: If you are allergic to iodine or seafood, or have had a previous reaction to any contrast dye, you should inform your physician before your exam. You should also inform the CT staff if you are:

• Allergic to other medications
• Diabetic
• Pregnant
• Have kidney problems

You will remove clothing worn over the area being examined and put on a dressing gown. A technologist will take and review your medical history and explain the examination. You will be asked to lie down on a cushioned table connected to the CT.

An IV line will be started so that an intravenous contrast solution can be used if necessary. A contrast material containing iodine may be injected into the bloodstream to enhance the view of blood vessels and blood flow in your body.

While you will be alone in the exam room, the technologist will be able to communicate with you throughout the exam. The table will begin moving through the CT's donut shaped ring. You will hear mechanical noises as pictures are taken and data is collected by the scanner. It is important to remain as motionless as possible during the CT exam, as any movement will affect the quality of the image produced.

The exam usually takes about 20 minutes to complete. Because sedation is not needed for this exam, you will be able to leave, eat or drive as soon as the exam is over. Following the CT scan, it's important to increase your water intake to help flush the IV or oral contrast from your body. All contrast materials will leave your body within 24 hours of the CT scan.

Your diagnostic report will be available within three business days. Please allow 7-10 days for your physician to receive and review your results. If you do not receive results within this 10-day window, please be sure to contact the physician who ordered your exam.

A CT scan is the same as a CAT scan. CT stands for "computed tomography" and CAT stands for "computed axial tomography". Both terms describe the same imaging test.