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Comparison of anti-scatter grids for digital imaging with use of a direct-conversion flat-panel detector

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Abstract

Our purpose in this study was to establish a selection standard for anti-scatter grids for a direct conversion flat-panel detector (FPD) system. As indices for grid evaluation, we calculated the selectivity, Bucky factor, and the signal-to-noise ratio improvement factor (SIF) by measuring rates of scatter transmission, primary transmission, and total transmission (based on the digitally displayed measurement values of the FPD system), using 4 acrylic phantoms of different thicknesses. The results showed that the SIF was less than 1.0 when the phantom thickness was 5 cm. When the phantom thickness was 25 cm and the grid ratio was 16:1, the SIF was 1.505 and 1.518 (maximum value) at 90 and 120 kV, respectively. Compared with the grid ratio of 12:1, the SIF at the grid ratio 16:1 was improved by 6.1% at 90 kV, and by 7.0% at 120 kV. In a direct-conversion FPD system, the grid ratio of 16:1 is considered adequate for eliminating the scattered-radiation effect when much scattered radiation is present, such as with a thick imaged object or a high X-ray tube voltage.

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Authors and Affiliations

  1. Department of Radiology, University Hospital, Kyoto Prefectural University of Medicine, 465 Kajii-cho, Kawaramachi-Hirokoji, Kamigyo-ku, Kyoto, 602-8566, Japan

    Masayoshi Mizuta, Yasuhiro Ikeno & Shigeki Mitou

  2. Graduate School of Health Science, Kanazawa University, 5-11-80 Kodatsuno, Kanazawa, 920-0942, Japan

    Shigeru Sanada

  3. Department of Radiological Technology, Faculty of Medical Science, Kyoto College of Medical Science, 1-3 Imakita, Oyama-higashi, Sonobe, Nantan, Kyoto, 622-0041, Japan

    Hiroyuki Akazawa & Toshifumi Kasai

  4. Department of Radiology, Osaka Medical Center and Research Institute for Maternal and Child Health, 840, Murodocho, Izumi, Osaka, 594-1101, Japan

    Shuji Abe

Authors
  1. Masayoshi Mizuta
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  2. Shigeru Sanada
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  3. Hiroyuki Akazawa
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  4. Toshifumi Kasai
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  5. Shuji Abe
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  6. Yasuhiro Ikeno
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  7. Shigeki Mitou
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Correspondence to Masayoshi Mizuta.

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Mizuta, M., Sanada, S., Akazawa, H. et al. Comparison of anti-scatter grids for digital imaging with use of a direct-conversion flat-panel detector. Radiol Phys Technol 5, 46–52 (2012). https://doi.org/10.1007/s12194-011-0134-1

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  • DOI: https://doi.org/10.1007/s12194-011-0134-1

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