2. Radiopharmaceutical To get the most information in a single tracer, it is best to mark the solid component. With solids, in addition to assessing antral motility is measured indirectly by the state of the gastric tone, once they have been crushed and can be emptied. For this, 50 g huevina will beat with 1 mCi (37 MBq) of 99m Tc-sulfur colloid and immediately cook a tortilla.