1. Health
You can opt-out at any time. Please refer to our privacy policy for contact information.

Contrast Dye


Updated December 09, 2013

Definition: Contrast dye is a solution that is used to accentuate specific structures when looking at an image.

In X-ray and CT studies, the contrast dye is substance that absorbs the X-ray photons, and does not allow them to be detected by the X-ray film or CT scanner. Contrast dye can be injected into your blood vessels (to show the vessels), it can be ingested orally (to show the upper gut), or inserted into the rectum (to show the lower gut). In some CT scans, all three types of contrast (so-called "triple contrast") are used.

MRI contrast works differently, but also accentuates the differences between tissues. The MRI contrast alters the magnetic properties of tissue. The altered properties will differentiate tissue types on the MRI image.

  1. About.com
  2. Health
  3. Orthopedics
  4. Hand & Wrist
  5. Contrast Dye

©2014 About.com. All rights reserved.

We comply with the HONcode standard
for trustworthy health
information: verify here.