Image-receptor performance: A comparison of trophy RVG UI sensor and KodakEktaspeed Plus film

Objective. This study compares the physical characteristics of the RVG UI s ensor (RVC) With Ektaspeed Plus film. Study design. Dose-response curves were generated for film and for each of 6 available RVG modes. An aluminum step-wedge was used to evaluate exposure latitude. Spatial resolution was assessed by using a line-pair test tool. Latitude and resolution were assessed by observers for both modalities. The RVG was further characterized by its modulation transfer function. Results. Exposure latitude was equal for film and RVC in the periodontal mo de. Other gray scale modes demonstrated much lower latitude. The average ma ximum resolution was 15.3 line-pairs per millimeter (lp/mm) for RVG in high -resolution mode, 10.5 lp/mm for RVG in low-resolution mode, and greater th an or equal to 20 lp/mm for film (P < .0001). Modulation transfer function measurements supported the subjective assessments. Conclusions. In periodontal mode, the RVG UI sensor demonstrates exposure l atitude similar to that of Ektaspeed Plus film. Film images exhibit signifi cantly higher spatial resolution than the RVC images acquired in high-resol ution mode.