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  • 1
    ISSN: 1613-9674
    Keywords: Computed radiography ; Atomic number ; Contrast medium ; Dual-energy subtraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Computed radiography was applied for one-shot dual-energy subtraction sialography. Basic studies using this technique were carried out to determine which elements would be suitable for possible use as contrast media in the clinical setting. Contrast media using elements with an atomic number close to 65 (terbium: Tb) were shown to be effective in subtraction of bone images. The results suggest that the development of a new contrast media using those elements would make the widespread clinical application of one-shot dual-energy subtraction sialography possible.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1613-9674
    Keywords: Intraoral radiography ; Computed radiography ; Frequency processing ; Imaging plate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Radiographic information on the imaging plate was read with a pixel size of 50 μm×50 μm and recorded with 100 μm×100 μm. Various frequency-enhanced images were produced by an unsharp masking process that can maximize the spatial frequency enhancement at 0.25, 0.50, 1.00, 2.00, and 4.00 cycles/mm. Using these images, the effect of frequency enhancement processing for the X-ray diagnosis of normal anatomical structures and simulated bone changes on intraoral computed radiography was investigated. The imaging conditions under which the most valuable radiographic images for diagnosis of normal anatomical structures were obtained was a frequency type that diminished the low level density area, a non-linear gradation and an enhancement rank of 4 at the spatial frequency of 2.00 cycles/mm. These iamges projected a higher image quality than conventional periapical films. In addition, the intraoral computed radiography had equivalent or better ability to detect fine-simulated bone changes compared to conventional periapical films. These findings suggest that the spatial frequency enhancement area needed to obtain images with significant diagnostic value, equivalent to or better than conventional periapical film images, is 2.00 cycles/mm in intraoral computed radiography, with maximal spatial resolution of 5.00 cycles/mm.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1613-9674
    Keywords: Computed radiography ; Imaging plate ; K-edge ; One-shot dual energy subtraction radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The author produced a bone-iodine step (BI-step) phantom and performed a basic experiment using it in one-shot dual energy subtraction sialography by computed radiography (CR). There are many parameters of energy subtraction such as the tube voltage, filter, Imaging Plate (IP), grid, contrast medium, and image processing. In this study, the author evaluated the influence of tube voltage (50 ∼100 kVp), copper (Cu) and tin (Sn) filters, and the iodinated contrast medium on the resultant image. The conditions of optimal subtraction were theoretically determined, and the separation between bone and iodine reached a maximum at a tube voltage of 50kVp with a Cu-filter of 0.8 mm in this investigation. The correctness of these conditions were confirmed on actual subtraction images. These results appear to be applicable to digital subtraction sialography following a further combination with the other parameters.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Oral radiology 8 (1992), S. 11-19 
    ISSN: 1613-9674
    Keywords: Computed radiography ; Imaging plate ; Scattering radiation ; One-shot dual energy subtraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract I applied one-shot dual energy subtraction by computed radiography using iodinated contrast medium to sialography. In this study, a basic experiment was carried out on the effects of scattering radiation on subtraction using a bone-iodine step phantom sandwiched between soft tissue plates and a head phantom with fixed tubes containing contrast medium (head·contrast medium phantom). The relationship between the tube voltage (50–100 kVp) and the thickness of a copper (Cu) filter as well as the presence or absence of a grid was studied. Subtraction images were clearer without a grid than with a grid. These findings suggest that scattering radiation is one of the factors responsible for the favorable effects of one-shot dual energy subtraction sialography.
    Type of Medium: Electronic Resource
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