Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
Volume 64, Issue 2
Displaying 1-9 of 9 articles from this issue
  • Takashi NUMAKURA, Susumu KITAZAWA, Eiko NAKAZIMA, Etsuo FUJII
    2001 Volume 64 Issue 2 Pages 65-76
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Restoration of deteriorated (faded and discolored) color photographic images by use of the color scanner loaded with GIS (golden imaging software) was tested. In this scanning process, the values of the maximum (shadow) and the minimum (highlight) densities of the deteriorated images were read and supplied to the scanning program. Then the restored image having the color characteristics corresponding to that of original film was obtained automatically according to the function of GIS. The deteriorated color target and pictures were processed and evaluated by CIELAB color difference and gamut. It was shown that the proposed method is effective for the restoration of deteriorated pictures by subjective and objective evaluation.
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  • Fumiyuki SHIBA, Yusuke OKAWA, Takashi OHNO, Hiroyuki KOBAYASHI
    2001 Volume 64 Issue 2 Pages 77-84
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Critical supersaturation ratio, S*, of monodisperse AgCl grains in the controlled double-jet precipitation was experimentally determined on the basis of a potentiometric measurement of supersaturation ratio, S, and theoretical relationships between S and the supply rate of reactants, Q. For cubic grains, the relationship is derived as (S-1) =Q/12DConsLs in S<S* whereas (S-1) =Q/12DCo (nsLs+nnLn) in S>S*, where D the diffusivity, Co the solubility of bulk solid, ns and nn the numbers of seed grains and new nuclei, respectively, and Ls and Ln the edge lengths of seed grains and new nuclei, respectively. The critical supersaturation ratio was defined as S at the inflection point in the relationship between (S-1) and Q/nsLs. The definition of S* was confirmed with transmission electron microscopy. Under the condition of pCl 3.0 and 50°C, S* was determined as 1.077-1.097 and almost independent of the size and number of seed grains. The critical nucleus size, critical growth rate, and magnitude of driving force of growth were also discussed.
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  • Nakahiro YASUDA, Kenichi KUGE, Takaharu KOBAYASHI, Naokazu AOKI, Akira ...
    2001 Volume 64 Issue 2 Pages 87-91
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    A new method to obtain three-dimensional information on nuclear ion beam tracks was developed using color multi-layered photographic materials. Commercial color films were irradiated with ion beams. The tracks were represented with a color image in which different depths were indicated by different colors, and the three-dimensional information was obtained from color changes. We also prepared a self-coating color nuclear emulsion plate which consisted of three layers including a nuclear emulsion and a color coupler. Details of this method, and advantages and limitations were discussed in comparison with a conventional method using a nuclear emulsion.
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  • Yasushi NOZAWA, Hideto IKOMA, Masaharu OKANO
    2001 Volume 64 Issue 2 Pages 92-99
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    High speed color negative films are inclined to suffer from increase in fog, decrease in speed and deterioration in graininess during their preservation. This damage was mostly caused by natural background radiation. We classified the natural background radiation into three groups: cosmic rays, radiation from radioactive substances around film and radiation from radioactive substances in film. We made clear the degree of influence of each group on high speed color negative film properties. The sensitivity of silver halide photographic emulsion to gamma ray is in proportion to the absorption of gamma ray by the emulsion and the intrinsic sensitivity of the emulsion.
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  • Yasushi NAKANO, Hideaki WAKAMATSU, Satoshi HONDA
    2001 Volume 64 Issue 2 Pages 100-104
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    The main component of a computed radiography (CR) system is its photostimulable phosphor and a unique fabrication of the plate to improve image quaity in the CR system. The use of a BaFI: Eu phosphor produced uniformly by crystal generation in solution provided exceptional performance, becauseiodide's high atomic weight furnishes a high x-ray absorption coefficient and, thus, low x-ray quantum noise. Furthermore, sharpeness is maintained because light scattering is minimized by a anti-scattering layer between the plate and its protective outer layer.
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  • Chika HONDA, Kouji AMITANI, Masayuki NAKAZAWA
    2001 Volume 64 Issue 2 Pages 105-118
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Although SF (screen-film) systems have long proven their merit in medical radiographic imaging, CR (computed radiography) systems have begun to win wide implementation because of the capabilities of digital medical imaging systems. This paper presents a technical comparison and discussion of SF and CR systems from the standpoint of medical image quality. Many papers have reported that CR images are clinically comparable to SF images in general radiography (with the exception of breast radiography), while papers on bedside chest radiography generally conclude that CR systems are superior to SF systems. Today, CR systems appear poised to advance hand-in-hand with other digital medical imaging technologies such as FPD (flat panel x-ray detectors), x-ray CT (computed tomography), and MRI (magnetic resonance imaging), as well as with new PACS (picture archiving and communication system) installations.
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  • Yasushi KAGOSHIMA, Yoshiyuki TSUSAKA, Junji MATSUI, Kazushi YOKOYAMA, ...
    2001 Volume 64 Issue 2 Pages 119-125
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Recently, x-ray refraction contrast imaging has attracted great interest because it produces images of much higher contrast than that obtained with conventional x-ray imaging. The refraction contrast imaging is based on the refraction phenomenon of x-rays, which has long been considered to be negligible. Its point of excellence is that non-absorbing samples can be imaged clearly. In this paper, the principle of the refraction contrast imaging is briefly described, and some applications to still pictures using a laboratory x-ray source and to live pictures using synchrotron radiation of SPring-8 are presented.
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  • Ikuo KOBAYASHI
    2001 Volume 64 Issue 2 Pages 126-132
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    During the 20th century, film badges have been applied to the most of our personal radiation monitoring in Japan. Now just at a time entering into the 21st century, solid-state dosemeters are widely being employed in place of film badges. Here I will describe the exposure measurement principles and characteristics of some newly developed solid-state dosemeters as well as those of existing film badges. Details are explained of the Luxel optically stimulation dosimetry badges which Nagase-Landauer are now starting to use for our personal radiation monitoring services. Finally perspective views are presented of this area in Japan.
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  • Yuichi HOSOI
    2001 Volume 64 Issue 2 Pages 133-142
    Published: April 25, 2001
    Released on J-STAGE: August 11, 2011
    JOURNAL FREE ACCESS
    Imaging plate is an ionizing radiation image sensor, which utilizes photo-stimulable phosphor. This paper explains the principle of radiographic imageing by the imaging plate, and its applications in medical and biological fields.
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