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With increasing usage of computed tomography angiography (CTA) in recent years, more and more attentions have been paid to the potential risk of cancer related to radiation exposure during the procedures, especially to those patients who have chronic diseases and have to undergo examinations frequently for continuous treatment and monitoring . In order to reduce this risk, the radiation dose should be kept as low as possible; meanwhile, an adequate image quality sufficient for making diagnosis should be maintained. Moreover, the adverse reactions caused by contrast material (CM) also possess some concerns to patients� health . Among these concerns, acute renal failure is one of the notorious complications of procedures involving application of iodinated contrast media. For example, the contrast medium-induced nephropathy may account for about 12% of all cases of the nosocomial renal failure . Therefore, prevention of such a nephropathy is crucial as it is associated with an increased mortality rate . Since the adverse reactions are associated with the effectively consumed iodine amount, a small amount of CM should be used in scanning protocol to minimize the impairment of patients,


While positioning you on an exam table, the technologist will explain your procedure and answer any questions you may have. If contrast dye is being used, it will be injected through your IV. During the injection, you may experience a warm sensation all over your body and a metal taste in your mouth. This is normal. If you experience any itching, sneezing, nasal congestion, scratchy throat or swelling of your face, please notify the technologist immediately. The exam table will slide into the scanner, only covering the part of your body which is being studied. The scanner is open at the back and the front, allowing you to see out. The technologist will always be able to see and hear you during your exam. You may be asked to hold your breath for a short time while the scanner takes a series of pictures. The time it takes to actually acquire images is very brief. The images will be reviewed, and if necessary, some may be repeated. This procedure usually takes approximately 15-30 minutes. Your total time commitment will be approximately an hour and a half. Below: Image of a CT angiogram of the blood vessels in the neck. The vertebral artery is between the vertical lines. The arrow points at the spine.


Continue taking all of your current medications. Do not take Viagra, Cialis or Levitra for 48 hours before exam.

Because you will need to wear a hospital gown for your exam, wear clothing that can be changed easily.

Leave all jewelry and valuables at home.

If your doctor gave you an order, please bring it with you.

Though we do not anticipate any delays in your exam, please consider bringing a book, magazine or music player to help you pass the time while you are waiting.