RESOLUTION AS DEFINED BY LINE SPREAD AND MODULATION TRANSFER-FUNCTIONS FOR 4 DIGITAL INTRAORAL RADIOGRAPHIC SYSTEMS

Line spread functions for four commercially available systems for dire ct digital intraoral radiography were determined from images of a slit of negligible width. From the fitted line spread functions presamplin g modulation transfer functions were calculated. The four systems were the Sens-A-Ray (Regam Medical System AB, Sundsvall, Sweden), the VIXA /Visualix (Gendex, Chicago III.), the RVG (Trophy Radiologic, Paris, F rance), and the Flash Dent (Villa Sistemi Medicale srd, Buccinasco, It aly). Digital intraoral radiography is in a state of rapid development , and detectors as well as computer hardware and software are continua lly modified and improved resulting in successively changing system pa rameters. As this occurs the present work provides a method that may b e used to determine comparable data on future systems.