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Here is an attempt to reach more accurate radiologic diagnosis and prognosis by application of mathematical formulas to roentgenography of the chest. The first part deals with roentgenography of the lung. It describes methods for finding the square area of lung lesions and gives a scale of shades determined by the density of shadows cast by normal organs in the thorax. Mathematical formulas are then given by means of which the volume of the lesions may be estimated from their square area and the density as indicated by the shade of the lesions. The author emphasizes the value of serial examinations for prognosis. The second part deals with roentgenography of the mediastinum. The author advances the theory that differences in depth of shadow cast by various mediastinal organs are not due to different densities of the organs, as has been commonly accepted. He asserts that the depth of shadow and
Études radiologiques sur le poumon et le médiastin.. JAMA. 1930;95(15):1122. doi:10.1001/jama.1930.02720150062034
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