title: Computer-aided detection of peripheral lung cancers missed at CT: ROC analyses without and with localization.
abstract: OBJECTIVE
  To retrospectively evaluate whether a difference-image computer-aided detection (CAD) scheme can help radiologists detect peripheral lung cancers missed at low-dose computed tomography (CT).
  
  
  METHODS
  Institutional review board approval and informed patient and observer consent were obtained. Seventeen patients (eight men and nine women; mean age, 60 years) with a missed peripheral lung cancer and 10 control subjects (five men and five women; mean age, 63 years) without cancer at low-dose CT were included in an observer study. Fourteen radiologists were divided into two groups on the basis of different image display formats: Six radiologists (group 1) reviewed CT scans with a multiformat display, and eight radiologists (group 2) reviewed images with a "stacked" cine-mode display. The radiologists, first without and then with the CAD scheme, indicated their confidence level regarding the presence (or absence) of cancer and the most likely position of a lesion on each CT scan. Receiver operating characteristic (ROC) curves were calculated without and with localization to evaluate the observers' performance.
  
  
  RESULTS
  With the CAD scheme, the average area under the ROC curve improved from 0.763 to 0.854 for all radiologists (P = .002), from 0.757 to 0.862 for group 1 (P = .04), and from 0.768 to 0.848 for group 2 (P = .01). The average sensitivity in the detection of 17 cancers improved from 52% (124 of 238 observations) to 68% (163 of 238 observations) for all radiologists (P < .001), from 49% (50 of 102 observations) to 71% (72 of 102 observations) for group 1 (P = .02), and from 54% (74 of 136 observations) to 67% (91 of 136 observations) for group 2 (P = .006). The localization ROC curve also improved.
  
  
  CONCLUSIONS
  Lung cancers missed at low-dose CT were very difficult to detect, even in an observer study. The use of CAD, however, can improve radiologists' performance in the detection of these subtle cancers.
authors.affiliation: Kurt Rossmann Laboratories for Radiologic Image Research, Department of Radiology, University of Chicago, IL 60637, USA. feng@uchicago.edu
authors.forename: Feng
authors.initials: F
authors.lastname: Li
authors.forename: Hidetaka
authors.initials: H
authors.lastname: Arimura
authors.forename: Kenji
authors.initials: K
authors.lastname: Suzuki
authors.forename: Junji
authors.initials: J
authors.lastname: Shiraishi
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Abe
authors.forename: Roger
authors.initials: R
authors.lastname: Engelmann
authors.forename: Shusuke
authors.initials: S
authors.lastname: Sone
authors.forename: Heber
authors.initials: H
authors.lastname: MacMahon
authors.forename: Kunio
authors.initials: K
authors.lastname: Doi
mesh_terms: D000368:Aged; D003936:Diagnosis, Computer-Assisted; D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D012372:ROC Curve; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed