Felix A. Breuer1, Nicole Seiberlich2, Martin Blaimer1, Peter M. Jakob1,3, Mark A. Griswold2
1Research Center Magnetic Resonance Bavaria (MRB), Wrzburg, Germany; 2Dept. of Radiology, Case Western Reserve University, Cleveland, OH, USA; 3Dept. of Experimental Physics 5, University of Wrzburg, Wrzburg, Germany
In this abstract,a framework for quantitative estimation of the non-uniform noise enhancement in GRAPPA reconstructions (the so-called GRAPPA g-factor) where multiple kernels are employed is introduced. This abstract includes g-factor calculations for radial GRAPPA reconstructions where multiple kernels are required due to the lack of Cartesian symmetry in the undersampled k-space. This concept allows one to quantitatively estimate the noise characteristics of non Cartesian GRAPPA prior to the actual GRAPPA reconstruction and therefore can help to identify the optimal GRAPPA reconstruction parameters