Jesse I. Hamilton1, Katherine L. Wright1, Mark A. Griswold2, Nicole Seiberlich1
1Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States; 2Radiology, Case Western Reserve University, Cleveland, OH, United States
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.