Abstract #2643

Efficient Non-Cartesian SPIRiT Without Explicit Consecutive Regridding and Gridding

Claudio Santelli¹,², Tobias Schaeffter¹, Sebastian Kozerke,¹²

¹Imaging Sciences and Biomedical Engineering, Kings College London, London, United Kingdom; ²Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland

A modified coil-sensitivity based calibration operator was incorporated into non-Cartesian CG-like SPIRiT. While maintaining image quality, significant reduction in reconstruction time has been demonstrated for simulated spiral and radial data. In addition, the exchangeability of the two consecutive k-space interpolation steps with a diagonal matrix multiplication has been shown. Depending on the number of k-space samples, reconstruction times on the order of the highly optimized NUFFT gridder are achieved.