. Radiography, x-ray therapeutics and radium therapy . after the meal.—Small intestine empty ; ascendingcolon visible. (/) 7 Ten hours after the meal.—The large intestine is visible as faras the left flexure. {g) Twenty four hours after the m£al.—The large intestine is filled as faras the rectum. These are roughly the times for a barium meal; when a bismuth salt isused the time given must be proportionately lengthened. VARIATIONS IN THE TECHNIQUE 217 There are several variations from the routine which may be employedto suit individual cases, the screening may be greatly prolonged whe
. Radiography, x-ray therapeutics and radium therapy . after the meal.—Small intestine empty ; ascendingcolon visible. (/) 7 Ten hours after the meal.—The large intestine is visible as faras the left flexure. {g) Twenty four hours after the m£al.—The large intestine is filled as faras the rectum. These are roughly the times for a barium meal; when a bismuth salt isused the time given must be proportionately lengthened. VARIATIONS IN THE TECHNIQUE 217 There are several variations from the routine which may be employedto suit individual cases, the screening may be greatly prolonged whenit is desirable to make observations on the motility of the stomach, or incases of irritable stomach with or without duodenal ulcer. In pyloric ulceror cancer of the pylorus valuable observations may be made by the screenmethod. Dr. Jefferson, working in the X-ray department at the Cancer Hospital,London, has obtained a number of most interesting plates of these of the alimentary tract commonly met with vaW best be shown. Fig. 166.—Diagrams to illustrate the stages of a bismuth meal. • a, b, and c show the stomach in process of filling with the bismuth food. d shows the fully distended stomach immediately after completion of the meal. e, Several hours after: Food passing from the stomach through pylorus into duodenum ; foodin small intestine. /, Stomach nearly empty ; food in small intestine (ileum), and commencing to fill up thecfecum. by taking a number of plates dealing first with the normal and later withthe departures from the normal. The radiographic method is of the greatest value when a succession ofplates can be obtained, as the stomach may be observed during the processof filling. Small quantities may be watched passing into the organ andtaking a definite course along the lesser curvature. 218 KADIOGEAPHY Modifications of the Opaque Meal for Special Investig-ations.— The bismuth or barium sulphate may be made very thin and a small q
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