USE OF THE EUROPEAN IMAGE QUALITY CRITERIA FOR SCREEN-FILM COMPARISON- APPLICATION FOR ASYMMETRIC SYSTEMS

The aim of this study is the comparison of two different techniques of image evaluation: by phantom simulation and by patient anatomical cri teria using those proposed in a European Union working document. Both methods of evaluation were applied to asymmetric and conventional scre en-film systems. The European image quality criteria as a tool for com paring the use of image systems is a reasonably valid and objective me thod. However, a complete practical description of a system using comp lementary phantom images and test object is a convenient means of obta ining a comprehensive description of the system. Results show that sha rpness of mobile organs and the visualization of the retrocardiac and retromammal lung, in posteroanterior projection, and vertex in lateral projection is improved with the InSight system. The phantom images su ggest, however, an important loss of resolution and contrast.