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Abstract #2273

Respiratory-Controlled Adaptive 4D Flow of the Aorta: Reproducibility and Comparison to 2D Phase Contrast Imaging

Qingdi Wang1, Xiaojing Guo1, Emma Hornsey2, Lucy McKenna2, Leonid Churilov1,3, Mark Brooks1,2, George Matalanis1,2, Jason Chuen1,2, Eric Poon1, Daniel Staeb4, Ning Jin5, Andrew Ooi1, and Ruth P Lim1,2
1The University of Melbourne, Melbourne, Australia, 2Austin Health, Heidelberg, Australia, 3The Florey Institute of Neuroscience and Mental Health, Melbourne, Australia, 4Siemens Healthcare Pty Ltd, Melbourne, Australia, 5Siemens Medical Solutions, Chicago, IL, United States

A four-dimensional phase-contrast magnetic resonance imaging sequence with respiratory-controlled adaptive k-space reordering (ReCAR-4DPC) offers potential benefits of improved scan efficiency and motion robustness. Imaging was performed on 15 volunteers and 2 patients with aortic dissection. Inter-scan repeatability and inter-reader agreement of flow metrics derived from ReCAR-4DPC was assessed and compared to metrics derived from 2-dimensional phase contrast imaging (2DPC). There was almost perfect inter-scan and inter-reader concordance (Lin's concordance correlation coefficient for all metrics > 0.91 and >0.98 respectively). Concordance with 2DPC was also high (LCCC all > 0.873). RC-4DFlow is reproducible and repeatable, with high concordance with 2DPC metrics.

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