title: Mammographic mass detection using a mass template.
abstract: OBJECTIVE
  The purpose of this study was to develop a new method for automated mass detection in digital mammographic images using templates.
  
  
  METHODS
  Masses were detected using a two steps process. First, the pixels in the mammogram images were scanned in 8 directions, and regions of interest (ROI) were identified using various thresholds. Then, a mass template was used to categorize the ROI as true masses or non-masses based on their morphologies. Each pixel of a ROI was scanned with a mass template to determine whether there was a shape (part of a ROI) similar to the mass in the template. The similarity was controlled using two thresholds. If a shape was detected, then the coordinates of the shape were recorded as part of a true mass. To test the system's efficiency, we applied this process to 52 mammogram images from the Mammographic Image Analysis Society (MIAS) database.
  
  
  RESULTS
  Three hundred and thirty-two ROI were identified using the ROI specification methods. These ROI were classified using three templates whose diameters were 10, 20 and 30 pixels. The results of this experiment showed that using the templates with these diameters achieved sensitivities of 93%, 90% and 81% with 1.3, 0.7 and 0.33 false positives per image respectively.
  
  
  CONCLUSIONS
  These results indicate that the detection performance of this template based algorithm is satisfactory, and may improve the performance of computer-aided analysis of mammographic images and early diagnosis of mammographic masses.
authors.affiliation: Istanbul Commerce University, RagIp Gumuspala Cad. No: 84 Eminonu 34378 Istanbul, Turkey. serhat@iticu.edu.tr
authors.forename: Serhat
authors.initials: S
authors.lastname: Ozekes
authors.forename: Onur
authors.initials: O
authors.lastname: Osman
authors.forename: A Yilmaz
authors.initials: AY
authors.lastname: Camurcu
mesh_terms: D000465:Algorithms; D001331:Automation; D005189:False Positive Reactions; D006801:Humans; D008327:Mammography / Q000379:methods*; D011856:Radiographic Image Enhancement; D012680:Sensitivity and Specificity