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Abstract #2717

Field Strength and B1 Influence on Kernel Support Selection for Highly Accelerated GRAPPA Reconstruction

Jun Miao1, Wilbur C. K. Wong2

1Biomedical Engineering, Case Western Reserve University, Cleveland, OH, USA; 2Computer Science and Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong

High magnetic field can provide an improvement of signal-to-noise ratio (SNR) in the MR images but creates larger B1 inhomogeneity, and its influence on k-space signals structure that affects kernel support selection remains unclear. Very commonly, an isotropic shape kernel is used in diffuse applications and field strengths. In this paper, we study k-space signals anisotropy in 3T and 7T MR phantom data sets, and compared our proposed anisotropic kernel to isotropic kernel for highly accelerated GRAPPA reconstruction. Experimental results showed that k-space signals anisotropy is correlated to B1 inhomogeneity, and anisotropic kernel is preferred over isotropic kernel for highly accelerated GRAPPA reconstruction, particularly in 7T MR data set.