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Abstract #4405

Temporal Filtering Effects in Dynamic Parallel MRI: Comparing Radial & Cartesian Sampling

Irene Paola Ponce Garcia1, Martin Blaimer2, Felix Breuer2, Peter M. Jakob1,2, Mark A. Griswold3, Peter Kellman4

1Experimental Physics 5, University of Wrzburg, Wrzburg, Bavaria, Germany; 2Research Center Magnetic Resonance Bavaria e.V (MRB), Wrzburg, Bavaria, Germany; 3Department of Radiology, University Hospitals of Cleveland & Case Western Reserve University, Cleveland, OH, United States; 4Laboratory of Cardiac Energetics, National Institutes of Health, National Heart, Lung & Blood Institute, Bethesda, MD, United States

In Auto-calibrated Dynamic Parallel Magnetic Resonance Imaging (pMRI), such TSENSE or kt-SENSE, the missing information is reconstructed using the spatial sensitivities of multiple receiver coils. The coil sensitivities are derived from the full FOV temporal average image (a.k.a direct current, DC) that is obtained by averaging the undersampled time frames. In Cartesian sampling, the averaging leads to aliasing artifacts and therefore to errors in the coil sensitivities estimates. As a result, the reconstructed images exhibit temporal filtering effects. In this work, we demonstrate that these temporal filtering effects are not significantly present in accelerated dynamic parallel MRI experiments using Radial sampling.