Comparison of image quality in optical and radiographic magnification techniques for fine-detail skeletal radiography: effect of object thickness Page: 2 of 38
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High-resolution radiography for skeletal imaging may be done
with optical or radiographic magnification procedures. In the former
technique, Industrial Type M film is used without screens, and the
image is viewed with 4-10x optical magnification. In the latter
technique, RP film is used with Detail screens and 4x geometric
magnification together with a microfocus x-ray tube having a 50 um
nominal focal spot size. The imagirg properties of these two high-
resolution techniques are evaluated by means of H & D curves, MTFs,
and noise Wiener spectra. The clinical applications of these
techniques are discussed. It is concluded that, for thin objects such
as the hand, the optical magnification technique provides better bone
images than the radiographic magnification technique employed in
this study. For thicker parts such as the knee, however, the radio-
graphic magnification technique results in superior skeletal images.
INDEX TERNS: Bone radiography, Hand, Knee, IYagnification Technique,
Image Quality, MTF, Noise Wiener Spectrum
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Doi, K.; Genant, H.K. & Rossmann, K. Comparison of image quality in optical and radiographic magnification techniques for fine-detail skeletal radiography: effect of object thickness, article, January 1, 1974; United States. (https://digital.library.unt.edu/ark:/67531/metadc1021083/m1/2/: accessed April 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.