What does double contrast mean in radiology?
In a double-contrast study, the radiologist uses two contrast agents to examine the organs in question. A double-contrast upper GI series uses an effervescent agent that creates carbon dioxide to distend the luminal organs and high-density barium to “scrub and paint” the mucosa. This study is also known as an air contrast upper GI series or a biphasic upper GI series .
Rugal folds are seen as radiolucent filling defects in the barium pool (white arrow) and as parallel barium etched lines ( black arrows ). Rugal folds are composed of mucosa and submucosa and are most prominent along the greater curvature of the stomach. The normal gastric antrum ( A ) has few, if any, rugal folds in most patients.
