File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14777133463).jpg

Identifier: americanjournroen09ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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ially increasesthe opacity to the rays. If the requestsfor x-ray examination indicate whetherthe cases are active or inactive, somewhatbetter plates may be obtained from thefollowing schedule of exposure. SCHEDULE FOR PLATES MADE AFTER PHYSH \IEXAMINATION Exposure in Seconds Inactive Active Plat! I Plate 2 Plate 1 Plate 2 I>, 2y2 ■-■ 234 ■4I:i4 3 i4 Thin chest Medium chest Thick chest Very thick, up to. . . ■4 2 If the difference in the time of exposurebe greater than the above, the dark plateis likely to predominate unduly in thefused image, and the general diagnosticvalue is therefore reduced. If the solepurpose of the plate is to demonstrateIdealized pneumothorax, this partial lossof detail does not matter, and the follow-ing schedule will sometimes demonstrateseparation of pleural surfaces when theroutine diagnostic plates showed indicatingsigns only. Roentgen-Ray Technique for the Demonstration of Small Pneumothorax 237 SCHEDULE FOR SPECIAL PLATES FOR PNEUMOTHORAX ONLY
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SPECIAL METHODS OF STUDY Plates Made at Full Expiration. Incertain cases of very slight peribronchialinvolvement, the pulmonary markingsmay be so slight that pleural surfaces arenot outlined even though considerableseparation is present, as the density ofthe lung tissue is not very different fromthat of the air pocket. In such cases platesmade at full expiration will sometimesshow the pleural surfaces distinctly, owingto the greater comparative density ofthe lung tissue. Remaking Plates. Often unforseen den-sities or unexpectedly clear lungs causethe plates made by any routine to beunsatisfactory. In such cases a second pairmay be made with longer or shorterexposures as may be indicated by thefirst pair. Unilateral Lesions. Of patients withdense involvement on one side and verylittle on the other, the same pair of platescannot satisfactorily show both sides ofthe chest. In such cases the best diagnosticwork sometimes requires one pair of platesfor each lung with the appropriateexposur

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