title: Classification of breast lesions with multimodality computer-aided diagnosis: observer study results on an independent clinical data set.
abstract: OBJECTIVE
  To evaluate a computer-aided diagnosis multimodality intelligent workstation as an aid to radiologists in the interpretation of mammograms and breast sonograms.
  
  
  METHODS
  An institutional review board approved the protocol for an observer study with signed consent, as well as the retrospective use of the mammograms, sonograms, and clinical data with waiver of consent. The HIPAA-compliant observer study was conducted with five breast radiologists and five breast imaging fellows, all of whom gave confidence ratings and patient management decisions, both without and with the computer aid, for 97 lesions that were unknown to both the observers and the computer. The performance of each observer without and with the computer aid was quantified by using four performance measures: area under the receiver operating characteristic curve (A(z)) value, partial A(z) value, sensitivity, and specificity. The statistical significance of the differences in the performance measures without and with the computer aid was determined by using a two-tailed t test for paired data.
  
  
  RESULTS
  Use of the computer aid resulted in an improvement of the average performance of the 10 observers, as measured by means of a statistically significant increase in A(z) value (0.87-0.92; P < .001), partial A(z) value (0.47-0.68; P < .001), and sensitivity (0.88-0.93; P = .005). A statistically significant difference was not found in the specificity without and with the computer aid (0.66-0.69; P = .20).
  
  
  CONCLUSIONS
  Use of multimodality intelligent workstations can improve the performance of radiologists in the task of differentiating malignant and benign lesions at mammography and sonography.
authors.affiliation: Department of Radiology, University of Chicago, 5841 S Maryland Ave, Chicago, IL 60637, USA.
authors.forename: Karla
authors.initials: K
authors.lastname: Horsch
authors.forename: Maryellen L
authors.initials: ML
authors.lastname: Giger
authors.forename: Carl J
authors.initials: CJ
authors.lastname: Vyborny
authors.forename: Li
authors.initials: L
authors.lastname: Lan
authors.forename: Ellen B
authors.initials: EB
authors.lastname: Mendelson
authors.forename: R Edward
authors.initials: RE
authors.lastname: Hendrick
mesh_terms: D000328:Adult; D001706:Biopsy; D001941:Breast Diseases / Q000000981:diagnostic imaging*; D003936:Diagnosis, Computer-Assisted; D003937:Diagnosis, Differential; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D008327:Mammography; D015588:Observer Variation; D012372:ROC Curve; D011857:Radiographic Image Interpretation, Computer-Assisted; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D016217:Ultrasonography, Mammary; D014584:User-Computer Interface