Final answer:
The best fluoroscopy procedure to demonstrate a gastric ulcer is an Upper GI series, which uses barium sulfate to visualize the stomach and small intestine on an X-ray.
Step-by-step explanation:
A patient with a history of a gastric ulcer would best be demonstrated using a fluoroscopy procedure known as an Upper GI series. This procedure involves ingestion of barium sulfate, which coats the lining of the esophagus, stomach, and small intestine, making the outline of these organs visible on an X-ray. The presence of an ulcer can be detected due to the barium filling in the lesion, allowing for clear visualization.
An esophagram is used to assess the esophagus, a barium enema is used for examining the large intestine or colon, and a cholecystogram is focused on the gallbladder. For a gastric ulcer, an Upper GI series is the most appropriate choice because it specifically targets the stomach and the initial parts of the small intestine where peptic ulcers are commonly located.