Ten patients presenting for an upper GI series with laparoscopically placed gastric bands were enrolled after informed consent. After a standard upper GI evaluation, oral administration of a standard 13 mm barium sulfate tablet was performed and swallowed with dilute liquid barium during fluoroscopic monitoring. A spot radiograph was obtained once the barium tablet was in the gastric pouch and the dilute liquid barium was passing through the gastric band stoma. Post-processing software used the longest radiographic dimension of the 13 mm barium tablet as the size reference to calibrate measurement of the gastric band stoma diameter.