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Golden angle dual‐inversion recovery acquisition coupled with a flexible time‐resolved sparse reconstruction facilitates sequence timing in high‐resolution coronary vessel wall MRI at 3 T
Author(s) -
Ginami Giulia,
Yerly Jérôme,
Masci Pier Giorgio,
Stuber Matthias
Publication year - 2017
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.26171
Subject(s) - magnetic resonance imaging , artificial intelligence , maximum a posteriori estimation , iterative reconstruction , computer science , image quality , position (finance) , computer vision , biomedical engineering , physics , nuclear medicine , mathematics , medicine , image (mathematics) , radiology , maximum likelihood , statistics , finance , economics
Purpose The need for performing dual‐inversion recovery (DIR) coronary vessel wall MRI in correspondence to minimal cardiac motion and optimal blood signal nulling is a major challenge. We propose to address this hurdle by combining DIR with a prolonged acquisition window in conjunction with a golden angle radial trajectory and k‐t sparse sensitivity encoding (SENSE) reconstruction to enable a flexible a‐posteriori selection of optimized imaging parameters. Methods Coronary vessel wall data acquisition was performed with DIR golden angle radial imaging in n=15 healthy subjects. Images reconstructed using k‐t sparse SENSE and different reconstruction window settings were quantitatively (vessel wall conspicuity, thickness, acquisition, and reconstruction window settings) compared with those obtained with more conventional radial DIR imaging. Results A flexible retrospective selection of the reconstruction window width and position improved vessel wall conspicuity with respect to baseline acquisitions ( P < 0.01). Vessel wall thickness remained unchanged ( P = nonsignificant (NS)). Temporal window widths were similar for both approaches ( P = NS), yet their position within the cardiac cycle differed significantly ( P < 0.02). Conclusions A flexible DIR coronary vessel wall MRI technique that alleviates constraints associated with sophisticated sequence timing was proposed. When compared with a more conventional approach, the technique significantly improved image quality. Magn Reson Med 77:961–969, 2017. © 2016 International Society for Magnetic Resonance in Medicine