title: A simplified method to obtain perceptibility curves for direct dental digital radiography.
abstract: OBJECTIVE
  To derive and test a simplified method to construct Perceptibility Curves (PCs) for dental digital detectors.
  
  
  METHODS
  Mathematical expressions were derived to make it possible to construct PCs from viewer data obtained at two exposures, one low and one high. PCs were constructed applying these expressions and compared with data previously obtained employing the conventional method.
  
  
  RESULTS
  PCs constructed according to the simplified method agree extremely well with conventionally obtained data.
  
  
  CONCLUSIONS
  Reliable PCs may be constructed according to the simplified method.
authors.affiliation: Department of Oral Radiology, Karolinska Institutet, Stockholm, Sweden.
authors.forename: H C
authors.initials: HC
authors.lastname: Stamatakis
authors.forename: K
authors.initials: K
authors.lastname: Yoshiura
authors.forename: X Q
authors.initials: XQ
authors.lastname: Shi
authors.forename: U
authors.initials: U
authors.lastname: Welander
authors.forename: W D
authors.initials: WD
authors.lastname: McDavid
mesh_terms: D006801:Humans; D008433:Mathematics; D015588:Observer Variation; D011856:Radiographic Image Enhancement / Q000295:instrumentation; D019252:Radiography, Dental, Digital / Q000295:instrumentation / Q000379:methods*; D015203:Reproducibility of Results