Cholografin® Meglumine is a contrast agent for intravenous cholangiography and cholecystography. Iodipamide's primary excretion through the hepato-biliary system and concentration in bile allows visualization of the gallbladder and biliary ducts.

A clinical trial is a controlled study involving human subjects, designed to evaluate prospectively the safety and effectiveness of new drugs or devices or of behavioral interventions.

See also Adverse Reaction and Safety of Contrast Agents.

(CR) Computed radiography is an imaging technique that uses similar equipment to conventional radiography except that films are replaced by imaging plates. An imaging plate contains photostimulable storage phosphors, which store the radiation level received at each point in local electron energies. The imaging plate is placed under the patient in the same way as conventional film cassettes. After x-ray exposure, the imaging plate is run through a special scanner to read out the image. The digital image can then be processed to optimize contrast, brightness, and zoom. Computed Radiography can be seen as halfway between film-based conventional technology and current direct digital radiography.

Cystografin® (USP30% or Cystografin®-Dilute USP 18%) is a radiopaque contrast agent for retrograde cystourethrography. Cystografin® is not intended for intravascular injection.

The darkroom fog is an additional optical density on a film due to light leaks or safe lights in a darkroom. Darkroom fog degrades the film contrast and must be eliminated to ensure image quality.