Abstract #2714

Creation of Arbitrary Spatial Harmonics Though the Combination of Orthogonal Weights (CASHCOW): a Generalized Direct GRAPPA Approach for Non-Cartesian Data

Nicole Seiberlich¹, Felix A. Breuer², Stephen R. Yutzy³, Martin Blaimer², Mark A. Griswold¹

¹Radiology, Case Western Reserve University, Cleveland, OH, USA; ²Research Center Magnetic Resonance Bavaria (MRB), Wuerzburg, Germany; ³Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA

Non-Cartesian parallel imaging is complicated by the varying locations of acquired points with respect to each Cartesian k-space location. The method proposed here uses the GRAPPA Operator formalism to generate GRAPPA weights which perform a shift directly from the arbitrarily located non-Cartesian points to a Cartesian location, without necessitating either an iterative reconstruction or a coil map. This method provides a link between GRAPPA and GROG, providing GRAPPA-like stability over large shift distances along with flexibility and limited weight set requirements of GROG. CASHCOW is demonstrated in vivo with a radial acquisition for acceleration factors of up to R=4.