Development and experimental implementation of new approaches to measure MTF and NPS

Abstract

In order to compare novel CT-geometries with existing ones, it is necessary to revise conventional quality assurance methods or develop new approaches. In a first step, this has been done for a determination of the Modulation Transfer Function (MTF) and the Noise Power Spectrum (NPS) parallel for reconstructed images and raw data. The analysis of the raw data received from a scan of a tungsten wire allowed to calculate the MTF of the detecting system independent of the reconstruction algorithm. Another new approach allowed the determination of the NPS out of the raw data independent of the number of slices of the detector.