To provide better resolution (i.e., clearer viewing and, thus, improved interpretation) of images, some CT scans involve the use of one of several contrast media (also called contrast dyes) that can be introduced into the body in different ways, such as:
• Being ingested (by drinking the contrast medium) to image parts of the gastrointestinal (GI) tract
• Being injected intravenously (IV; i.e., into a vein). For example, one type of contrast media contains a small amount of radioactive iodine. Patients who are allergic to iodine or shellfish should inform their physician, nuclear medicine physician, radiologist, and technician in order to avoid use of an iodine-containing contrast medium for a CT scan.
A potential side effect of certain contrast dyes is an allergic reaction.
If a contrast medium was ingested or injected during a CT scan, drinking lots of fluid after the scan helps to eliminate the contrast medium from the body.
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