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.