To evaluate gastric emptying, positive labeling of a meal is neccessary to obtain reliable results [4, 8]. Since the exprimental studies of Schwizer and Kunz in the 1990s, most authors have used gadolinium tetraazacyclododecane tetraacetic acid (Gd-DOTA) to label the meal, since it has been shown that Gd-DOTA is the most stable contrast agent in the acidic gastric environment. Moreover, Gd-DOTA adheres well to both fluids and solids, and is not easily absorbed by the gastrointestinal tract. It thereby provides excellent positive contrast [14].