@article{oai:kanazawa-u.repo.nii.ac.jp:00014537,
 author = {Tanaka, Rie and Shiraishi, Jyunji and 田中, 利恵 and 白石, 順二 and 高森, 美保 and 渡, 千寛},
 issue = {7},
 journal = {日本放射線技術学会雑誌 = Nihon Hoshasen Gijutsu Gakkai zasshi},
 month = {Jan},
 note = {本研究の目的は，被検者体動に起因する不鋭の検出能について医用LCDと画像プレビュー用LCDをROC解析によって比較評価することである．CRを用いて一定テンポで動くメトロノームを撮影し，動きによる不鋭を含む画像を104枚取得した．画像不鋭の程度を，振り子の角度から算出した振り子速度と撮影時間との積に基づいて5段階に分類した．医用LCDとして2MモノクロLCDを，プレビュー用LCDとして汎用カラーLCDを使用し，6名の観察者でROC解析による観察者実験を行った．LCDごとに算出した各観察者のROC曲線下面積の平均値は，医用LCDで0.952，プレビューLCDで0.850となり，両者の間には統計的有意差が認められた．医用LCDに表示することで被写体体動による画像の不鋭を検出する正確さは有意に向上した．プレビュー用LCD上では，被検者の体動に起因する画像不鋭を適切に評価できない可能性が示唆された．To evaluate the detectability of image unsharpness due to a patient's movement, a receiver operating characteristic (ROC) analysis was conducted to compare the diagnostic and preview liquid-crystal displays (LCDs). Phantom images that simulated a patient's movement were obtained by using a moving metronome and acrylic plates with a computed radiography (CR) system. A total of 104 images were classified into five groups according to the degrees of image unsharpness determined based on the metronome velocity and exposure time. In an ROC observer study (n=6), a 2-megapixel diagnostic monochrome LCD (2M-LCD) and a 1.3-megapixel general color LCD for preview (1.3M-LCD) were compared in terms of the detection of image unsharpness due to the movement. A statistical test was performed using the multi-reader multi-case (MRMC) method. In the results, the average areas under the ROC curve values for the detection of image unsharpness using the 2M-LCD and 1.3M-LCD were 0.952 and 0.850, respectively. The detection of image unsharpness using the 2M-LCD was significantly better than that using the 1.3M-LCD (p<0.05). In addition, some images with slight unsharpness were identified correctly only using the 2M-LCD. The results suggest that the low-resolution LCD (i.e., the 1.3M-LCD for preview) had a limitation in identifying image unsharpness due to the patient's movement. Slight unsharpness could be missed in primary image checks performed on a preview monitor equipped with an imaging system. Therefore, the high-resolution LCD (i.e., a 2M-LCD) is necessary when using radiography for diagnostics.},
 pages = {772--778},
 title = {ROC解析による患者体動に起因する不鋭の検出能の評価 : ファントム画像による診断用LCDと画像プレビュー用LCDの比較},
 volume = {67},
 year = {2011}
}