AN EVALUATION OF THE SENS-A-RAY DIGITAL DENTAL IMAGING-SYSTEM

The Sens-A-Ray digital imaging system was compared with group D- and E -speed intraoral radiographic film with respect to resolution, speed a nd image quality. Using a line-pair plate, resolution was determined t o be 10 line-pairs per millimetre. With a constant potential X-ray sou rce, the speed of the system was over three times that of E-speed emul sion and the response of pixel value to exposure was linear. Absorptio n curves with aluminium showed a similar response to D-speed film. An aluminium foil test object was used to compare the Sens-A-Ray system w ith both film types. Thirty observers were scored for successful ident ification of a pattern of holes in the test object. There was little d ifference between D- and E-speed film groups, and successful identific ation was significantly reduced with the Sens-A-Ray images when compar ed with D- and E-speed films.