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  • Duplicating films  (1)
  • computed tomography  (1)
  • diffused light  (1)
  • 1
    ISSN: 1349-9432
    Keywords: optical CT ; reconstruction of CT image ; depolarization of light ; diffused light ; phase modulation ; biological tissue ; scattering medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method utilizing light polarization was applied to take the projection data of absorbers in a highly scattering medium. The floor level of the projection data due to diffused light was significantly suppressed by detection of photons which preserved initial polarization. An optical computed tomgraphy image was reconstructed from the projection data taken by this method and exhibited higher spatial resolution than the image reconstructed from the projection data by conventional method.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1613-9674
    Keywords: Duplicating films ; Duplication ; Film sensitometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The purpose of the investigation was: 1) to derive the characteristic curves of Kodak, DuPont, Fuji, and Konica duplicating films; and 2) to compare their sensitivities, inherent contrasts, and latitudes. For statistical analysis the multivariate general linear model in Systat 4.1 with Sygraph was run on a Northgate 386/20 microcomputer. Kodak film had the highest Dmax, followed by those of Fuji, Konica and DuPont films. Fuji film was the most sensitive at higher densities whereas Kodak film was the most sensitive at lower densities, Konica and DuPont films were comparatively less sensitive. DuPont film had the highest inherent contrast, followed by Kodak, Konica, and Fuji films. Fuji film had the widest latitude, followed by Konica, Kodak, and DuPont films. The results of the experiment should not be construed as a recommendation for any particular type of duplicating film. The results might have been different if a different range of densities had been evaluated.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1613-9674
    Keywords: fibrous dysplasia ; maxillary sinus ; radiographic findings ; computed tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fibrous dysplasia is a relatively rare tumorous lesion in the maxillofacial region. The radiographic appearance of this lesion varies widely in the jaw. Generally, the occurrence rate is higher in the maxilla than in the mandible. The purpose of this study was to report six cases of fibrous dysplasia associated with the maxillary sinus. In this study, we examined radiographic patterns which demonstrated the lesion's affect on the sinus radiographically. Mixed radiopacity and radiolucency (the so-called ground glass appearance) was also seen in each of these cases. In four cases in which CT images were obtained, the lesion showed buccal expansion and infiltration into the maxillary sinus.
    Type of Medium: Electronic Resource
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