title: Clinical testing of the Ultra-Vision screen-film system for maxillofacial radiography.
abstract: The Ultra-Vision screen (Du Pont, Towanda, Pa.) contains a yttrium tantalate phosphor-emitting ultraviolet light and eliminates the crossover effect. Increased resolution has been proven in vitro and the purpose of the present study was to test these findings in a clinical situation. Fifteen pairs of skull radiographs were produced with the use of Du Pont Ultra-Vision Rapid screens and Kodak Lanex (Eastman Kodak, Rochester, N.Y.) screens both belonging to speed class 400. Objects were a cadaver head, a 3M phantom head (3M Corp., St. Paul, Minn.), and patients who were serially radiographed as controls in a dental implant study. The radiographs had identical densities, but contrast was varied deliberately. Twelve observers judged the radiographs blindly. Ninety-two percent of the ratings with respect to resolution favored the Ultra-Vision system. However, great doubt was expressed regarding contrast. The agreement between the observers was tested by a Cochran's Q test. The results confirm that the Ultra-Vision system exhibits an improved resolution compared with the Lanex system. Ultra-Vision is recommended whether improved resolution of the radiographs or an expected reduced patient dose is preferred.
authors.affiliation: Department of Radiology, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
authors.forename: I P
authors.initials: IP
authors.lastname: Sewerin
mesh_terms: D015921:Dental Implants; D005069:Evaluation Studies as Topic; D006801:Humans; D008334:Mandible / Q000000981:diagnostic imaging; D008961:Models, Structural; D011829:Radiation Dosage; D011861:Radiography, Dental / Q000295:instrumentation*; D015203:Reproducibility of Results; D012886:Skull / Q000000981:diagnostic imaging*; D014466:Ultraviolet Rays; D014963:X-Ray Intensifying Screens
chemical_list: D015921:Dental Implants