. Röntgen ray diagnosis and therapy . Pig. 71.—Various Types of Biliary Calculi. (Compare Figs. 7:2 and 73.) work is a strongly built tube of a low vacuum in connection witha large Ruhmkorff coil. It has been found that the soft tubes used for the reproductionof biliary calculi display their best energy so long as they are 116 THE RONTGEN RAYS comparatively new. Later on they show less contrast, just likevery hard tubes, even if provided with an attachment for regener-ation. If the tube works well from the beginning, the average. time of exposure should be about four minutes in thin individ-ua


. Röntgen ray diagnosis and therapy . Pig. 71.—Various Types of Biliary Calculi. (Compare Figs. 7:2 and 73.) work is a strongly built tube of a low vacuum in connection witha large Ruhmkorff coil. It has been found that the soft tubes used for the reproductionof biliary calculi display their best energy so long as they are 116 THE RONTGEN RAYS comparatively new. Later on they show less contrast, just likevery hard tubes, even if provided with an attachment for regener-ation. If the tube works well from the beginning, the average. time of exposure should be about four minutes in thin individ-uals, and about six in stout cases. The position of the patient while being skiagraphed is also an ABDOMEN 117 important factor. Ho should lie on his abdomen with about threepillows underneath his clavicles, as the elevation produced permits CM 00 00 CM


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