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 3T

作者：Ginami Giulia; Yerly Jerome; Masci Pier Giorgio; Stuber Matthias^*

来源：Magnetic Resonance in Medicine, 2017, 77(3): 961-969.

DOI：10.1002/mrm.26171

• Coronary vessel wall
• Compressed sensing
• Time-resolved DIR

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.

• 出版日期2017-3