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Abstract #4571

Improved Signal-To-Noise Ratio in Late Gadolinium Enhancement Imaging by Using Respiratory-Navigator-Rejected K-Space Lines

Mehmet Akakaya1, Jaime L. Shaw2, Thomas H. Hauser1, Reza Nezafat1

1Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States; 2Cedars-Sinai Medical Center, University of California, Los Angeles, CA, United States

3D late gadolinium enhancement (LGE) MRI is acquired in a segmented fashion over multiple heartbeats, which necessitates respiratory motion compensation. Prospective navigator (NAV) is commonly used, where k-space lines acquired immediately after the NAV signal are used for image reconstruction only if NAV is within a pre-defined gating window, whereas those outside the window are rejected and re-acquired, and the rejected lines are not utilized further. Sub-optimal SNR is another challenge in high-resolution LGE imaging. In this study, we sought to develop and evaluate a technique that utilizes the NAV-rejected k-space lines for improved SNR in high-resolution 3D LGE.