Step 1: The image shows oral contrast opacifying the stomach, duodenum, and small bowel loops - the appearance of a barium meal and follow-through (small bowel follow-through).
Step 2: A small bowel follow-through is a single contrast study using oral contrast, either barium or a water-soluble agent. It is often performed after an upper GI fluoroscopy study, as the contrast column moves from the stomach and duodenum into the small bowel.
Step 3: Most small bowel contrast examinations are done as part of an upper GI series - the barium meal followed by the follow-through films. It is useful for evaluating strictures, obstruction, diverticula, masses, extraluminal tethering, and abnormal motility.
Step 4: Barium enema fills the colon retrogradely, enteroclysis uses a naso-jejunal tube for direct small bowel infusion, and proctography images the rectum during defecation. The oral, antegrade opacification through stomach to small bowel here is a barium meal follow-through.