. Radiography and radio-therapeutics . d rapid emptying of thestomach contents. A gooddeal will depend upon thetechnique employed, the dura-tion of the exposure, the long exposure of afew years ago it was possibleto determine the delay in pass-age through the duodenum when it was of long duration, in anobstructive lesion the contents of the organ could be seen in these movements of the duodenum can be observed on the screen, and thismethod therefore has a definite value in the diagnosis of the lesion. Obser-vations should be made on the behaviour of the duodenum in all
. Radiography and radio-therapeutics . d rapid emptying of thestomach contents. A gooddeal will depend upon thetechnique employed, the dura-tion of the exposure, the long exposure of afew years ago it was possibleto determine the delay in pass-age through the duodenum when it was of long duration, in anobstructive lesion the contents of the organ could be seen in these movements of the duodenum can be observed on the screen, and thismethod therefore has a definite value in the diagnosis of the lesion. Obser-vations should be made on the behaviour of the duodenum in all cases. Thescreen method possesses the additional advantage of enabling the operatorto obtain radiographs of the parts where the signs are likely to be of observer who has been in the habit of interpreting from platesobtained by long exposures must be on his guard when using rapid exposuresfor the first time; owing to the rapidity of the exposure the wholeduodenum may be seen filled with food, similar to pictures obtained with. Fig. 304.—Opaque meal in ileum and cseciim, five hoursafter ingestion. Stomach was comi^letely the contracted ileum entering csecum, dilata-tion behind the contraction, and stasis of food in smallintestine. Figs. 304 and 307 being reproduced frompositives the position of the is reversed. THE SMALL INTESTINE 359 longer exposures when an obstructive lesion is present, and this might leadhim to make a wrong diagnosis. With very rapid exposures the whole of the duodenum may be shownfilled with the opaque food. Observations made on the screen, particularlywith regard to the time taken by the food to pass through the duodenum,should be sufficient to prevent such a mistaken impression. The serial radio-grams will be found useful in this connection, for it may be possible to showthe passage of the food and the time taken for a portion of it to pass through. The appearances presented by the duodenal cap may be taken asan indication
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