Tilman Johannes Sumpf1, Amir Moussavi1, 2, Martin Uecker1, 3, Susann Boretius1, 4, Jens Frahm1
1Biomedizinische NMR Forschungs GmbH am Max-Planck-Institut fuer biophysikalische Chemie, Goettingen, Germany; 2DFG Research Center for Molecular Biology of the Brain (CMPB), Goettingen, Germany; 3Electrical Engineering and Computer Science, University of California, Berkeley, United States; 4Klinik fr Diagnostische Radiologie, Universittsklinikum Schleswig-Holstein, Kiel, Germany
Quantitative evaluation of the T2 relaxation time is of high importance for diagnostic MRI. Standard T2 mapping procedures rely on the time-demanding acquisition of several fully-sampled k-space data sets. We recently evaluated a new method that allows for the reconstruction of spin-density and T2 maps from highly undersampled Cartesian data by exploiting data redundancy in parameter space. However, the effect of periodic phase alternations due to unavoidable motion in in-vivo experiments can cause severe artifacts in reconstructions from undersampled data. This work explains the origin of these artifacts and demonstrates the impact on reconstructions from undersampled high-field animal MRI data.