Comparison of image quality in optical and radiographic magnification techniques for fine-detail skeletal radiography: effect of object thickness Page: 10 of 38
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noise in RP-Dtail is quite different from that in Type M film, and
that, at a density of one, the effective noise in these two tech-
niques is comparable.
Results for Hand Radiographs
Radiographs of a hand phantom are prepared by means of optical
and radiographic magnification techniques. The quality of the two
radiographs are repeatedly examined by viewing them side by side
with the following procedure: the radiograph of FP-Det l is observed
by the naked eye and the radiograph of Type M film is observed
through a hand lens. The image sizes recognized by the visual system
are therefore about the same for the two radiographs.
Figure 8 shows a comparison of hand-phantom radiographs. The
image sizes of the two radiographs have been trade identical photo-
graphically to facilitate comparison of the image quality with the
two techniques. Our following observations on the two techniques
are based on the original radiographs rather than on the photographs
in Fig. 8, because the photographic reproduction necessarily alters
the appearance of the original radiographs. It may be noted that
fine bone trabeculae are imaged more sharply with optical magnifica-
tion (left) than with the radiographic magnification technique
(right). The noise in the two radiographs looks similar, although
the noise is slightly greater with optical magnification than with
radiographic magnification. The overall evaluation of the two
techniques is, therefore, that optical magnification provides better
bone images in hand radiography than does radiographic magnification.
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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/m1/10/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.