Most of the gastric diseases seat in the mucosa , and the present investigation was undertaken in order to see if amogastrin, a synthetic tetrapeptide, was capable of enhancing gastric accretion of intravenous 99mTc Pertechnetate in man as well as in the rabbit . Improvement of gastric scintigraphy was achievable with a pretreatment of the agent by increasing the gastric accretion and reducing the background radioactivity in the liver and small intestinum .