Subtracting empty scanner measurements reduces the influence of stationary background artifacts, but also requires additional computation and acquisition time while recording system matrices. Experimental evidence indicates that background subtractions can be replaced by a suitable high-pass-filtering of complex 2D-DCT coefficients of the system matrix. In combination with soft-thresholding our approach also reveals frequency components which partially remain buried in stationary noise even after background correction. This might lead to further improvements of image reconstructions.

This presentation is part of Minisymposium “MS56 - Mathematical and Computational Aspects in Magnetic Particle Imaging (2 parts)”
organized by: Tobias Kluth (University of Bremen) , Christina Brandt (University of Hamburg) .

Authors:

Hans-Georg Stark (Hochschule Aschaffenburg)

Florian Lieb (University of Applied Sciences, Aschaffenburg)

Keywords:

computed tomography, image reconstruction