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Abstract #1084

Long TR bSSFP Cardiac Cine Imaging at Low Field (0.55T) using EPI and Spiral Sequences for Improved Sampling Efficiency

Matthew C Restivo1, Rajiv Ramasawmy1, Daniel A Herzka1, and Adrienne E Campbell-Washburn1

1National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States

One key benefit of low field MRI (0.55T) is a more homogeneous B0 field due to the scaling of susceptibility with field strength. For cardiac imaging, where balanced steady-state free precession (bSSFP) is the dominate sequence, bSSFP banding artifacts are directly related to off-resonance phase accrual over each TR. We exploit the improved homogeneity by extending the TR of the clinical bSSFP cardiac cine sequence to improve sampling efficiency and thus SNR. Using fast, efficient acquisition strategies such as EPI and spiral, we can extend the TR from 3.1 to 8 ms to improve SNR without additional banding.

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