Effect of Interspaces of Anti-scatter Grid on the Image Improvement Factor

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  • Saito Hiroki
    Department of Radiology, Toyo Public Health College
  • Asano Hiroshi
    Department of Radiology, Kawasaki Kenshin Clinic
  • Miyake Hiroyuki
    Department of Diagnostic Radiology, Kawasaki Municipal Hospital
  • Nakamura Hiroaki
    Department of Radiology, NTT Medical Center Tokyo
  • Imai Yoshio
    Department of Radiology, NTT Medical Center Tokyo (Current address: Department of Radiorogy, Odawara Cardiovascular Hospital)
  • Ogura Izumi
    Department of Radiology Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University
  • Negishi Toru
    Department of Radiology Sciences, Graduate School of Human Health Sciences, Tokyo Metropolitan University

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Other Title
  • 散乱線除去グリッドの中間物質がイメージ改善係数に及ぼす影響
  • 臨床技術 散乱線除去グリッドの中間物質がイメージ改善係数に及ぼす影響
  • リンショウ ギジュツ サンランセン ジョキョ グリッド ノ チュウカン ブッシツ ガ イメージ カイゼン ケイスウ ニ オヨボス エイキョウ

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<p>The standard general purpose of anti-scatter girds: JIS Z 4910: 2015 (IEC 60627: 2013) has been revised, with the new addition of an image improvement factor (Q) to the physical characteristic. Using aluminum (Al) and fiber-interspaced anti-scatter grids; we studied the meaning of Q by calculating each of the physical characteristics and assessing the image. The experimental method was based on JIS Z 4910: 2015. The two anti-scatter grids had a grid ratio of 12: 1 and a strip frequency of 40 cm−1. Assessment items consisted of grid exposure factor (B), grid selectivity (Σ), contrast improvement ratio (K), and Q. In addition, the contrast to noise ratio (CNR) and contrast-detail curve (CD-curve) were determined from the contrast-detail phantom image, and the inverse image quality figure (IQF) was then calculated from the CD-curve. Compared to the Al-interspaced anti-scatter grid, the fiber-interspaced anti-scatter grid had B at 0.87, Σ at 0.95, K at 0.99, and Q at 1.14. In the assessment of the contrast-detail phantom image, the fiber-interspaced anti-scatter grid had an IQF of 1.02 times and a CNR of approximately 1.24 times when compared to the Al interspaced anti-scatter grid. The fiber-interspaced anti-scatter grid was superior with respect to the B and Q of the physical characteristics and to the CNR of image quality assessment.</p>

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