Computed Tomography

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We are proud to offer state-of-the-art diagnostic imaging services in Pasadena and Glendora, California, and surrounding counties.


How do I prepare for a CT Angiogram?

Your physician will ask you to avoid foods and liquids for about 4 hours before the test. You will probably be allowed to continue taking any prescribed medications, but ask your physician before the exam to be sure.

Before the test is performed, you may be asked to change into a hospital gown and remove all jewelry and other metal objects, which can interfere with x rays.

Am I at risk for complications?

Because CT angiography is an x-ray test, it sends radiation through your body. Although the amount of radiation for each scan is small, it can accumulate and damage body cells over time with repeated exposures.

Contrast material carries a slight risk of causing an allergic reaction. If you know that you are allergic to contrast material or dye, let your physician know before you receive the contrast material. In addition, allergies to iodine or shellfish may place you at increased risk for having an allergy to the contrast dye. If you are allergic to iodine or shellfish, alert your physician prior to the test. Medications can sometimes be given before the contrast material is administered to lessen the risk of allergic reactions in susceptible patients.

The contrast material is also eliminated by the kidneys and can damage kidney function, especially if you have kidney problems already. Let your doctor know if you have damaged kidney function. In this situation, medication and fluids, called hydration, can sometimes be given before the contrast material is administered to decrease the effects of the contrast dye on the kidneys. Blood tests may be done to evaluate your kidney function before the CT scan.

You may be unsuited for CT angiography if you:

  • Have an allergy to contrast dye
  • Have kidney problems
  • Have severe diabetes
  • Are pregnant, because radiation may harm the fetus
  • Have unstable vital signs
  • Weigh more than 350 pounds, because some x ray tables cannot support the weight

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