Meeting Banner
Abstract #3836

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

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.

Keywords

accumulated accurate accurately acquisition additional adjacent advantages aims appearance application applications arms array audience benefit benefits biomedical blurring breathing build calibrated calibrating calibration cardiac certain channel clinic clinically close coefficients coil collecting combine conceptually conditions datasets density deteriorated diastole done dynamics eight errors estimation fast footprint frame frames free fully generated grid highly hybrid impossible improves in vivo inaccurate inconvenient infeasible interleaved introduce introduced iterative kernel long major maps mark medicine merged merges merging minor motion moving namely necessarily need neighboring nonetheless note numerical occurs often orientation outperformed outweigh parallel particular phantom potentially problem projection projections radial radiology rapid rapidly read real reconstruct reconstruction reconstructions rectilinear removed representative require required reserve respectively sampled scanning segment self sense sensitivities sensitivity separate severe sharing shorter simulated simulations since slice slices slight slow solutions space spatial speeds spiral suggested symmetric systole target temporal temporally took trajectories trajectory transform uniform unlike useful variable view western wright zero