Innovative method for objective evaluations of the quality of CT systems

Abstract

An innovative method is presented that allows an objective and quantitative determination of quality parameters in computed tomography (CT). In contrast to projection radiography, the image quality parameters of a CT system is not only affected by the performance of the detector alone but additionally by the geometrical alignment of source-object-detector and the combination of numerous single raw exposure frames to one image using a specific reconstruction algorithm. Our scientific objective is to separate the effects of detector and image reconstruction algorithm on the performance of a CT. We focus here on the determination of the Modulation Transfer Function (MTF) and Noise Power Spectrum (NPS) of raw data and CT image. © 2009 Springer-Verlag.