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The authors' intent in this work is to increase the reader's skill in extracting physiologic information from the plain chest film. They state that one source of inspiration was a lecture by a great chest radiologist, Leo Rigler, published in July 1959, in which he noted that the conventional roentgenogram was not just a static anatomical image but, within certain limits, could be seen as a moving, functional tool. Rigler was aware of the skepticism with which the free translation of roentgenographic images into physiologic terms was regarded, but noted that physiologic interpretation was to be an addition to, not
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