カテゴリ: 論文誌(論文単位)グループ名: 【C】電子・情報・システム部門発行日: 2011/11/01タイトル(英語): Method for Measuring Contrast-to-Noise Ratio (CNR) in Non-uniform Image Area on Digital Radiography著者名: 森 政樹（名古屋大学医学部保健学科），今井 國治（名古屋大学医学部保健学科），池田 充（名古屋大学医学部保健学科），飯田 葉子（名古屋大学医学部附属病院），伊藤 富貴子（名古屋大学医学部附属病院），米田 和夫（名古屋大学医学部附属病院），遠地 志太（大阪大学医学部附属病院）著者名(英語): Masaki Mori (Nagoya University School of Health Sciences), Kuniharu Imai (Nagoya University School of Health Sciences), Mitsuru Ikeda (Nagoya University School of Health Sciences), Youko Iida (Nagoya University Hospital), Fukiko Ito (Nagoya University Hospital), Kazuo Yoneda (Nagoya University Hospital), Yukihiro Enchi (Osaka University Hospital)キーワード: CNR解析，Top-hat変換，ディジタルX線画像，画像ノイズの評価，正規分布，コントラスト分解能 CNR Analysis，Top-hat Transform，Digital X-ray Image，Evaluation of Image Noise，Gauss Distribution，Contrast Resolution要約(英語): One of physical indices for evaluating the image quality of digital radiography is contrast-to-noise ratio (CNR). The CNR was reported to simulate the human perception. Thus, the CNR is a variable index for evaluating detectability for digital radiography. However, it is difficult to evaluate the CNR in non-uniform image area. In this study, we have devised a new method for measuring CNR in non-uniform image area on digital radiography using top-hat transform. Furthermore, we investigated the radiation dose dependence of CNR in the digital image of an anthropomorphic breast phantom containing a simulated calcification. We have shown that the CNR in non-uniform image area can be analyzed with high accuracy by our devised method for measuring CNR. In the radiation dose dependence of CNR, CNR increased with mAs values and reduced depending on the increase in the concentration of glandular in the anthropomorphic breast phantom.本誌: 電気学会論文誌C（電子・情報・システム部門誌） Vol.131 No.11 （2011） 特集：電気関係学会関西連合大会本誌掲載ページ: 1975-1982 p原稿種別: 論文／日本語電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejeiss/131/11/131_11_1975/_article/-char/ja/
