A dye is usually a coloring agent. In medical imaging the term dye refers to radiopaque material used during x-ray examinations to provide or increase contrast in the different tissues and organs. Dye usually refers to intravenous contrast agents.

See also Contrast Agents.

Hypaque Meglumine is an ionic contrast agent. Hypaque Meglumine 60 percent (w/v) is an aqueous solution containing 60 g of the meglumine salt of diatrizoic acid per 100 mL of solution.
The degree of contrast enhancement at computed tomography is directly related to the amount of iodine administered. In adults the amount of iodine usually required for contrast enhancement ranges from 28 to 42 g.
Hypaque Meglumine is also available in concentrations of 18% and 30%.

Isovue® is a nonionic contrast agent with a wide range of iodine concentrations.
Isovue-370 with its highest concentration of contrast approved for CT is an excellent agent to match the speed and power of multi-detector row CT (MDCT). Prefilled syringes provide easy and efficient contrast media handling. Isovue-M® is indicated for CT myelography.

See also Contrast Media Injector, Single-Head CT Power Injector, Multi-Head Contrast Media Injector, Syringeless CT Power Injector.

Sinografin® (diatrizoate meglumine and iodipamide meglumine) is a contrast agent indicated for use in hysterosalpingography. Intrauterine used contrast agents have few known pharmacological effects. Most of the medium within the uterine cavity is discharged immediately after finishing of the procedure and the contrast medium retained is completely absorbed.

Viscosity is measured in centipoise (cP). The viscosity of water at 20° C is approximately 1 cP. Viscosity depends on temperature, size and shape of the dissolved particle.
The viscosity of contrast agents is an important factor in diagnostic imaging procedures like angiography and other studies where the injection rate can be of critical importance. Warming the contrast agent to body temperature may achieve higher flow rates. Contrast media are approximately twice as viscous at 20° C as at body temperature.