The effect of thin K-edge filters on the image quality of D- and E-speed dental film.

Abstract

The use of K-edge filters and fast speed dental (non-screen) film have been separately shown to reduce the radiation dose imparted during dental radiography. The effect of these on image quality has been unclear. This study objectively examines the effect on image quality of eight film/filter systems: E- and D-speed film and four filter systems (the existing aluminium filter used alone or with erbium, niobium or yttrium). The components of the image quality parameters assessed were contrast, resolution, the minimum perceptible contrast (noise) and the square wave response function. No clinically significant difference in image quality was observed. This was confirmed by subjective assessment of images of an anatomical phantom. It is concluded that the use of faster speed film in addition to K-edge beam filtration has no major effect on the clinical image.