title: Prediction of perceptibility curves of direct digital intraoral radiographic systems.
abstract: OBJECTIVE
  To derive and test a method to predict Perceptibility Curves (PCs) for direct digital intraoral radiographic systems.
  
  
  METHODS
  A test object was used to determine the performance of an average observer with respect to the threshold contrast and internal noise of the human visual system. These data were combined with system parameters to predict PCs mathematically.
  
  
  RESULTS
  Data on the performance of an average observer could be defined to obtain values of the effective threshold contrast as a function of background gray level. This function combined with the gamma-value of the system predicted PCs that agreed well with PCs obtained in the conventional way.
  
  
  CONCLUSIONS
  It is possible to predict PCs from a limited number of system parameters together with predetermined data on an average observer.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Kyushu University, Fukuoka, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshiura
authors.forename: H C
authors.initials: HC
authors.lastname: Stamatakis
authors.forename: U
authors.initials: U
authors.lastname: Welander
authors.forename: W D
authors.initials: WD
authors.lastname: McDavid
authors.forename: X Q
authors.initials: XQ
authors.lastname: Shi
authors.forename: S
authors.initials: S
authors.lastname: Ban
authors.forename: T
authors.initials: T
authors.lastname: Kawazu
authors.forename: T
authors.initials: T
authors.lastname: Chikui
authors.forename: S
authors.initials: S
authors.lastname: Kanda
mesh_terms: D016477:Artifacts; D005544:Forecasting; D006801:Humans; D008962:Models, Theoretical; D019252:Radiography, Dental, Digital; D015203:Reproducibility of Results; D012684:Sensory Thresholds; D013674:Technology, Dental; D013679:Technology, Radiologic; D014796:Visual Perception