GRAPPA acceleration of Cartesian magnetic resonance fingerprinting (MRF) at 7T

MR fingerprinting enables for robust simultaneous quantitative parametric mapping and is usually performed with spiral acquisitions. These are particularly sensitive to B1 inhomogeneities and hence more susceptible at ultra high-field. To mitigate B1 inhomogeneity effects, we implemented a Cartesian MRF approach. Cartesian 2D data collection time is somewhat slow, and we overcome this by demonstrating the feasibility of GRAPPA acceleration for applications in phantoms and in vivo. We present a fully sampled Cartesian data set in a phantom and in vivo, and we present the performance of increasing GRAPPA acceleration factors to reduce scan time significantly, without compromising image quality.