Dimeric
Often used alone for dimeric contrast media. Most contrast media are built around a ring structure (a benzene ring) to which up to 3 iodine atoms could be chemically attached called monomeric contrast media. In order to be able to deliver more iodine per unit, 2 such rings were linked, resulting in a larger molecule with up to 6 iodine atoms attached. Since it is the total amount of iodine that decides how good the contrast effect in the picture/image is, use of dimerics will give more contrast per molecule at the same time reducing the incidence and severity of most adverse reactions. Dimeric contrast media may be ionic ("Ratio 2 or ratio 3 ") or non-ionic ("Ratio 6 ").
GE Healthcare Glossary