A CT scan with contrast uses a special dye to help highlight specific organs, blood vessels, and tissues on the detailed X-ray images, providing clearer results than a standard CT scan. The contrast can be given orally, intravenously (in your arm), or rectally (by enema), depending on the area of the body being scanned. Patients may experience temporary warmth, a metallic taste, or fullness, and should inform their doctor about any allergies or kidney problems, as serious reactions, though rare,

What Is the Contrast Dye Used in CT Scans (and How Does It Work)?