Radiographic Correlations

  • Paul J. Friedman

Abstract

Radiographs are shadow images whose patterns of black and white result from the differential attenuation of x—rays during their passage through the tissues (Figs. 32-1 and 32-2). The physical properties of the tissues that account for these differences are density (g/cm3) and thickness, and the average atomic number (Z) of the atoms encountered by the x—rays. Depending on the energy of the x-ray beam, the relative attenuation by high-Z atoms (calcium, barium, iodine, lead) varies from a linear function of Z to a power function, Z 3. This accounts for the much greater contrast between bone and soft tissue on low—kilovoltage films. The whiteness at any point on the film reflects the total attenuation by all the tissues or materials in the path of the x-ray beam to that point, modified by the secondary x-ray scatter from these interactions.

Keywords

Bronchiolitis Obliterans Solitary Pulmonary Nodule Chest Film Alveolar Filling Extrinsic Allergic Alveolitis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer Science+Business Media New York 1988

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  • Paul J. Friedman

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