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―

• 田中 利恵

  金沢大学医薬保健研究域保健学系

• 白石 順二

  熊本大学大学院生命科学研究部

• 高森 美保

  石川県立中央病院放射線室

• 渡 千寛

  金沢大学大学院医学系研究科

書誌事項

タイトル別名

• ROC Analysis for Evaluating the Detectability of Image Unsharpness due to the Patient's Movement: Phantom Study Comparing Preview and Diagnostic LCDs
• ROC カイセキ ニ ヨル カンジャタイドウ ニ キイン スル フエイ ノ ケンシュツノウ ノ ヒョウカ ファントム ガゾウ ニ ヨル シンダンヨウ LCD ト ガゾウ プレビューヨウ LCD ノ ヒカク

抄録

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.

収録刊行物

• 日本放射線技術学会雑誌

  日本放射線技術学会雑誌 67 (7), 772-778, 2011

  公益社団法人 日本放射線技術学会

キーワード

• patient’s movement
• motion detectability
• preview monitor
• receiver operating characteristic (ROC)
• liquid crystal display (LCD)

詳細情報

• CRID: 1390001206361065088
• NII論文ID: 10029140904
• NII書誌ID: AN00197784
• DOI: 10.6009/jjrt.67.772
• COI: 1:STN:280:DC%2BC3MjitFegsQ%3D%3D
• ISSN: 18814883
• ISSN: 03694305
• NDL書誌ID: 11194554
• PubMed: 21799278
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11194554
• Web Site: https://search.jamas.or.jp/link/ui/2011312086
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • PubMed
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可