CT Perfusion

A newer type of computed tomography (CT), CT perfusion imaging, measures how blood moves through vessels in the body. CT perfusion is most often used to diagnose and manage stroke, as a lack of blood flow in part of the brain indicates ischemia, or a loss of oxygen due to obstruction or narrowing. Perfusion CT helps provide information about the severity and prognosis of a stroke, as well as the appropriateness of certain emergency treatments such as thrombolysis.

PRE-TEST GUIDELINES

Before CT perfusion, the physician will perform a physical examination and take the patient's medical history. Patients should drink several glasses of water before a CT perfusion scan. The patient should provide a list of all medications, supplements, and herbs he or she takes, and remove objects that may interfere with x rays, such as:

Jewelry;
Wigs or hairpieces;
Hairpins; or
Partial dentures.

WHAT TO EXPECT

The patient will enter the perfusion room and lie down on the scan table. The contrast agent will be administered via IV. CT perfusion is generally a quick technique, requiring only a few minutes. The machine will move over the patient and take a series of images, often from several angles. It is important for the patient to stay still during the test.

POST-TEST GUIDELINES

Patients can resume normal activities immediately. However, patients who received sedation should arrange for a ride home. If patients have been given a contrast agent, they are asked to drink fluids for hydration and to speed the body's excretion of the contrast following the test.

POSSIBLE COMPLICATIONS

CT has a low risk of complications; allergic reaction to the contrast dye, kidney failure, and tissue damage may occur in rare cases.

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