Self-calibrated trajectory estimation and signal correction method for robust radial imaging using GRAPPA operator gridding

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Anagha DeshmaneMark Griswold

Abstract

In radial imaging, projections may become "miscentered" due to gradient errors such as delays and eddy currents. These errors may result in image artifacts and can disrupt the reliability of direct current (DC) navigation. The proposed parallel imaging-based technique retrospectively estimates trajectory error from miscentered radial data without extra acquisitions, hardware, or sequence modification. After phase correction, self-calibrated GRAPPA operator gridding (GROG) weights are iteratively applied to shift-miscentered projections toward the center of k-space. A search algorithm identifies the shift that aligns the peak k-space signals by maximizing the sum-of-squares DC signal estimate of each projection. The algorithm returns a trajectory estimate and a corrected radial k-space signal. Data from a spherical phantom, the head, and the heart demonstrate that image reconstruction with the estimated trajectory restores image quality and reduces artifacts such as streaks and signal voids. The DC signal level is increased and variability is reduced. Retrospective phase correction and iterative application of GROG can be used to successfully estimate the trajectory error in two-dimensional radial acquisitions for improved image...Continue Reading

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Citations

Oct 23, 2016·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Stephen F CauleyLawrence L Wald
Aug 7, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Sumeeth V Jonathan, William A Grissom
Mar 2, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Merry ManiMathews Jacob
Mar 11, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Wenwen JiangMichael Lustig
Sep 28, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Amir Moussavi, Susann Boretius
Jul 20, 2019·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Lorenzo Di SopraJérôme Yerly
Sep 13, 2015·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Julianna D Ianni, William A Grissom
Dec 20, 2018·Journal of Magnetic Resonance Imaging : JMRI·Robert R Edelman, Ioannis Koktzoglou
Nov 30, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Sebastian RosenzweigMartin Uecker
Dec 1, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Sophia KronthalerDimitrios C Karampinos
Mar 31, 2021·Journal of Magnetic Resonance·Kevin D Harkins, Mark D Does

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