CT Head Without Contrast and CT Sinuses With Intravenous Contrast

What is this test?

This is a combined CT examination of the head and paranasal sinuses. The head portion is performed without contrast, while the sinus portion uses intravenous contrast, which is injected into a vein to improve the visibility of selected tissues and blood vessels.

Why might I need this test?

Your clinician may order this study to evaluate head or facial trauma, persistent sinus symptoms, suspected infection or inflammation, fluid collections, or abnormalities seen on another examination or imaging study. The head scan can also help assess the brain when symptoms suggest bleeding, swelling, or another structural problem.

How is the test performed?

You will lie on a table that moves through a CT scanner, which uses X-rays to create detailed images. The scan is generally painless and usually takes only a few minutes. If contrast is needed for the sinus portion, it may be injected into a vein, and the technologist may briefly scan the injection site to check for leakage.

How do I prepare for the test?

Tell the care team if you have ever had an allergic reaction to iodinated contrast, kidney problems, or any other significant medical conditions. You may be asked about medications, pregnancy, and recent contrast injections. Follow the facility's instructions about eating, drinking, and taking medicines; contrast is commonly given through an intravenous line.