Journal of The Society of Photographic Science and Technology of Japan
Online ISSN : 1884-5932
Print ISSN : 0369-5662
ISSN-L : 0369-5662
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Volume 72, Issue 6
Displaying 1-6 of 6 articles from this issue
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Special Topics: New Development of X-Ray Imaging Techniques in Medical Imaging
  • X-Ray Detector for Digital Fluoroscopy and Digital Radiography in Medical Imaging
    Keiichi Saito
    2009 Volume 72 Issue 6 Pages 379-385
    Published: 2009
    Released on J-STAGE: November 11, 2011
    DOIhttps://doi.org/10.11454/photogrst.72.379
    JOURNAL FREE ACCESS
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    Recently digital X-ray detectors are developed for medical imaging. By comparison with the structure of X-ray image intensifier system and X-ray flat panel detector (FPD), the dynamic of digital images is more superior and would result in enhanced diagnosis. Moreover the difference from the detective quantum efficiency (DQE) of X-ray image intensifier and FPD is shown as the significant index of X-ray image quality.
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  • High-Resolution Mammography Detector Employing Optical Switching Readout
    Kaku Irisawa, Yasuhisa Kaneko, Katsutoshi Yamane, Tomonari Sendai, Yui ...
    2009 Volume 72 Issue 6 Pages 386-392
    Published: 2009
    Released on J-STAGE: November 11, 2011
    DOIhttps://doi.org/10.11454/photogrst.72.386
    JOURNAL FREE ACCESS
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    Conceiving a new detector structure, FUJIFILM Corporation has successfully put its invention of an X-ray detector employing "Optical Switching" into practical use. Since Optical Switching Technology allows an electrode structure to be easily designed, both high resolution of pixel pitch and low electrical noise readout have been achieved, which have consequently realized the world's smallest pixel size of 50×50 μm2 from a Direct-conversion FPD system as well as high DQE. The digital mammography system equipped with this detector enables to acquire high definition images while maintaining granularity. Its outstanding feature is to be able to acquire high-precision images of microcalcifications which is an important index in breast examination.
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  • Trial of X-Ray Grating Interferometry for Phase-Contrast Imaging with a Practical X-Ray Tube
    — Application of Talbot-Lau Interferometry to Medical Imaging —
    Kazuhiro Kido, Chiho Makifuchi, Junko Kiyohara, Tsukasa Itou, Chika Ho ...
    2009 Volume 72 Issue 6 Pages 393-398
    Published: 2009
    Released on J-STAGE: November 11, 2011
    DOIhttps://doi.org/10.11454/photogrst.72.393
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    An imaging system of X-ray grating interferometry, i.e., Talbot-Lau interferometry, was created with a medical X-ray tube, a multi-slit, two X-ray gratings, and an X-ray detector on the basis of design with wave-optic simulation. Imaging performance of the system was examined so that bone cartilage of a chicken wing was depicted clearly with X-ray dose at 3 mGy. Using this imaging system, a small angle scattering image of a cherry was obtained successfully to depict its vascular bundle of the inner structure of the cherry that was invisible in its X-ray absorption image. This imaging trial suggests that the X-ray Talbot-Lau interferometry is a promising tool to detect soft tissue in human body for X-ray image-diagnosis besides the magnetic resonance imaging.
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  • Material Identification from X-Ray Images Made with Energy-Differentiation Type Radiation Line Sensor
    Masao Matsumoto, Naoki Takayama
    2009 Volume 72 Issue 6 Pages 399-405
    Published: 2009
    Released on J-STAGE: November 11, 2011
    DOIhttps://doi.org/10.11454/photogrst.72.399
    JOURNAL FREE ACCESS
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    It was confirmed that linear attenuation coefficient and effective atomic number of objects (carbon, Poly methyl methacrylate (PMMA), aluminum) could be identified by X-ray 2D and CT images discriminated by different energy. The difference ratio between theoretical and experimental values of linear attenuation coefficient of each object obtained from X-ray images were 0.01–22.6% for carbon, 0.01–23.1% for PMMA at photon energy from 50 to 80 keV, and 0.07–22.1% for aluminum at photon energy from 60 to 100 keV. The effective atomic number of each object from X-ray images was obtained as 6.0±0.3 for carbon (Z=6.0), 6.48±1.38 for PMMA (Z=6.48), and 13.0±0.3 for aluminum (Z=13.0). But, these differences of theoretical and measured effective atomic numbers are large relatively, and it is necessary to perform a further examination for the improvement for practical use of the material identification from X-ray images.
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