Self-Calibrating Interleaved Reconstruction for Through-Time Non-Cartesian GRAPPA

Jesse I. Hamilton¹, Katherine L. Wright¹, Mark A. Griswold², Nicole Seiberlich¹

Despite the high acceleration factors that are achievable with through-time non-Cartesian GRAPPA, the major limitation of this method is the need for a separate fully-sampled calibration scan. Here we present a self-calibrating method for through-time non-Cartesian GRAPPA using interleaved trajectories. In free breathing, non-gated cardiac scans, the self-calibrating reconstruction with both interleaved radial and interleaved variable density spiral trajectories produced images with higher quality and less blurring compared to view-sharing without parallel imaging reconstruction. Due to its shorter temporal footprint, less blurring was observed with self-calibrating through-time non-Cartesian GRAPPA using an undersampled spiral trajectory than the radial trajectory.