Keywords: New Trajectories & Spatial Encoding Methods, Acquisition Methods
Motivation: Well established clinically used parallel imaging techniques like GRAPPA and CAIPIRINHA are mostly limited to Cartesian sampling, and their extension to non-Cartesian sampling is not direct.
Goal(s): We propose to extend the SPARKLING framework to ensure GRAPPA accelerated Cartesian sampling in k-space center, while allowing non-Cartesian sampling in the periphery.
Approach: Through affine constraints, we can enforce Cartesian acceleration in the center of k-space, while allowing non-Cartesian sampling in the periphery.
Results: Using 2x2 GRAPPA with SPARKLING trajectories for anatomical MRI with MPRAGE sequences enables 10x acceleration, achieving 1mm isotropic whole-brain scans in 1 minute.
Impact: This novel technique will help bring conventional multi-coil acceleration to non-Cartesian imaging, which can be used independently to massively accelerate MR scans, enabling faster and higher resolution imaging, which will be beneficial for varied clinical applications.
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