title: Evaluation of tuned-aperture computed tomography in the detection of simulated periodontal defects.
abstract: OBJECTIVE
  The objective of this study was to compare the diagnostic efficacy of tuned-aperture computed tomography (TACT) and conventional film for the detection of simulated periodontal defects.
  
  
  METHODS
  Periodontal defects were created in 15 premolar-molar interproximal sites selected from 8 cadaver jaw segments. Ten observers viewed 45 image pairs (baseline and follow up) in 4 TACT modalities and film to assess the presence of defect. The TACT modalities were 1st and 2nd generation prototype systems (TACT-1 and TACT-2) with circular (C) and random (R) distribution patterns of source projection (TACT-1C, TACT-1R, TACT-2C, TACT-2R). Observer performance and related factors were analyzed by using receiver operating characteristic and analysis of variance.
  
  
  RESULTS
  Mean A(z) values were 0.64 for film, 0.74 for TACT-1C, 0.82 for TACT-1R, 0.64 for TACT-2C, and 0.69 for TACT-2R. TACT-1R was significantly better than film (P < .001), TACT-2C (P < .001) and TACT-2R (P = .007).
  
  
  CONCLUSIONS
  TACT-1R provided the best diagnostic performance in the detection of simulated periodontal defects among the 5 modalities compared in this study.
authors.affiliation: Division of Oral and Maxillofacial Radiology, Department of General Dentistry, Tufts University School of Dental Medicine, Boston, Mass 02111, USA. aruna.ramesh@tufts.edu
authors.forename: Aruna
authors.initials: A
authors.lastname: Ramesh
authors.forename: John B
authors.initials: JB
authors.lastname: Ludlow
authors.forename: Richard L
authors.initials: RL
authors.lastname: Webber
authors.forename: Donald A
authors.initials: DA
authors.lastname: Tyndall
authors.forename: David
authors.initials: D
authors.lastname: Paquette
mesh_terms: D000465:Algorithms; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging*; D000704:Analysis of Variance; D006801:Humans; D012372:ROC Curve; D011861:Radiography, Dental / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*