title: Computed radiography utilizing laser-stimulated luminescence: detectability of simulated low-contrast radiographic objects.
abstract: Threshold contrasts of low-contrast objects with computed radiography (CR) images were compared with those of blue and green emitting screen-film systems by employing the 18-alternative forced choice (18-AFC) procedure. The dependence of the threshold contrast on the incident X-ray exposure and also the object size was studied. The results indicated that the threshold contrasts of CR system were comparable to those of blue and green screen-film systems and decreased with increasing object size, and increased with decreasing incident X-ray exposure. The increase in threshold contrasts was small when the relative incident exposure decreased from 1 to 1/4, and was large when incident exposure was decreased further.
authors.affiliation: Department of Radiological Technology, College of Medical Science, Kumamoto University, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Higashida
authors.forename: N
authors.initials: N
authors.lastname: Moribe
authors.forename: Y
authors.initials: Y
authors.lastname: Hirata
authors.forename: K
authors.initials: K
authors.lastname: Morita
authors.forename: S
authors.initials: S
authors.lastname: Doudanuki
authors.forename: Y
authors.initials: Y
authors.lastname: Sonoda
authors.forename: N
authors.initials: N
authors.lastname: Katsuda
authors.forename: Y
authors.initials: Y
authors.lastname: Hiai
authors.forename: W
authors.initials: W
authors.lastname: Misumi
authors.forename: M
authors.initials: M
authors.lastname: Matsumoto
mesh_terms: D007834:Lasers; D008163:Luminescent Measurements; D011856:Radiographic Image Enhancement; D014057:Tomography, X-Ray Computed; D014963:X-Ray Intensifying Screens