title: Comparison of the diagnostic accuracy of direct digital radiography system, filtered images, and subtraction radiography.
abstract: BACKGROUND
  TO COMPARE THE DIAGNOSTIC ACCURACY OF THREE DIFFERENT IMAGING SYSTEMS: Direct digital radiography system (DDR-CMOS), four types of filtered images, and a priori and a posteriori registration of digital subtraction radiography (DSR) in the diagnosis of proximal defects.
  
  
  METHODS
  The teeth were arranged in pairs in 10 blocks of vinyl polysiloxane, and proximal defects were performed with drills of 0.25, 0.5, and 1 mm diameter. Kodak RVG 6100 sensor was used to capture the images. A posteriori DSR registrations were done with Regeemy 0.2.43 and subtraction with Image Tool 3.0. Filtered images were obtained with Kodak Dental Imaging 6.1 software. Images (n = 360) were evaluated by three raters, all experts in dental radiology.
  
  
  RESULTS
  Sensitivity and specificity of the area under the receiver operator characteristic (ROC) curve (Az) were higher for DSR images with all three drills (Az = 0.896, 0.979, and 1.000 for drills 0.25, 0.5, and 1 mm, respectively). The highest values were found for 1-mm drills and the lowest for 0.25-mm drills, with negative filter having the lowest values of all (Az = 0.631).
  
  
  CONCLUSIONS
  The best method of diagnosis was by using a DSR. The negative filter obtained the worst results. Larger drills showed the highest sensitivity and specificity values of the area under the ROC curve.
authors.affiliation: Department of Dentistry, Federal University of Sergipe, Aracaju, Sergipe, Brazil.
authors.forename: Wilton Mitsunari
authors.initials: WM
authors.lastname: Takeshita
authors.forename: Lilian Cristina
authors.initials: LC
authors.lastname: Vessoni Iwaki
authors.forename: Mariliani Chicarelli
authors.initials: MC
authors.lastname: Da Silva
authors.forename: Liogi Iwaki
authors.initials: LI
authors.lastname: Filho
authors.forename: Alfredo De Franco
authors.initials: Ade F
authors.lastname: Queiroz
authors.forename: Lucas Bachegas Gomes
authors.initials: LB
authors.lastname: Geron
keywords: Filtered images; digital radiology; digital subtraction radiography; digitized X-rays; interproximal caries