Digital and conventional chest imaging: A modified ROC study of observer performance using simulated nodules

Academic Article


  • A modified receiver operating characteristic (ROC) study was performed in which five readers were asked to locate multiple nodules on images of an anthropomorphic phantom obtained with a prototype digital radiographic chest unit and with a conventional chest unit. Results indicate that when nodules were projected over the lungs, a significantly greater number (significant at the 5% level) were identified on conventional radiographs, whereas for nodules projected over the mediastinum, the digital images were notably superior (difference significant at the 2% level). An error analysis of the multiple nodule problem and pseudo-ROC curves are presented. The modified ROC study does not suffer from the positional ambiguity inherent in most ROC studies and is efficient in acquiring data.
  • Published In

  • Radiology  Journal
  • Digital Object Identifier (doi)

    Pubmed Id

  • 19192106
  • Author List

  • Chakraborty DP; Breatnach ES; Yester MV; Soto B; Barnes GT; Fraser RG
  • Start Page

  • 35
  • End Page

  • 39
  • Volume

  • 158
  • Issue

  • 1