分散法とエッジ法による ディジタルマンモグラフィの解像特性の比較

  • 松林 由紀子
    倉敷成人病センター放射線技術科(現 公益財団法人中国労働衛生協会)
  • 濱野 美月
    倉敷成人病センター放射線技術科(現 いしづか乳腺外科クリニック)
  • 石井 里枝
    徳島文理大学保健福祉学部診療放射線学科
  • 北川 薫
    倉敷成人病センター放射線技術科(現 神戸大学医学部附属病院放射線部)
  • 石井 美枝
    岐阜医療科学大学保健科学部放射線技術学科
  • 眞田 泰三
    岡山済生会総合病院画像診断科
  • 吉田 彰
    県立広島大学大学院総合学術研究科

書誌事項

タイトル別名
  • Comparison between Variance and Edge Methods for Measuring Image Resolution Properties in Digital Mammography
  • ブンサンホウ ト エッジホウ ニ ヨル ディジタルマンモグラフィ ノ カイゾウ トクセイ ノ ヒカク

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抄録

<p>We studied the image resolution properties in digital mammography using the variance and edge response function methods. The associated measurements were made using a polymethylmethacrylate phantom of 0–40 mm thickness while maintaining the incident dose to the detector constant, as well as with and without using the phantom but by varying the level of exposure to the detector. The results obtained using the two methods were compared on the object plane of the mammography unit with compensation for the magnification and rejection of the scattered radiation. In this unit, the imaging process of resolution enhancement may be performed according to the phantom thickness, shape of test device, exposure level, and so on. The modulation transfer function values of the variance method were slightly higher than those of the edge method, approximately 6% at 2 cycles/mm and 8% at 4 cycles/mm without resolution enhancement processing. We concluded that the variance method is more suitable than the edge method for the constancy test or quality control because of its lower coefficient of variation.</p>

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