[Image quality parameters characterizing radiologic imaging systems].

Abstract

The image quality of imaging systems can be characterized by a number of parameters, such as the easy to appreciate concepts of resolution or contrast or such precisely defined and measurable characteristics as the modulation transfer function or the noise spectrum. The meaning of these qualities and their interrelation are discussed. From these parameters, we can derive one of the most important characteristics for the description of the physical image quality = the signal-to-noise ratio.