Abstract #4448

High-Performance 0.55T Supports Contrast-Optimal SMS bSSFP Cardiac Imaging

Ye Tian¹, Sophia X. Cui², Yongwan Lim¹, Nam G. Lee³, Ziwei Zhao¹, and Krishna S. Nayak¹

¹Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, United States, ²Siemens Medical Solutions USA, Inc., Los Angeles, CA, United States, ³Biomedical Engineering, University of Southern California, Los Angeles, CA, United States

Synopsis

Balanced steady-state free precession (bSSFP) cardiac cine MRI at 1.5T and 3T is routinely used for cardiac function assessment. Simultaneous multi-slice (SMS) imaging significantly reduces the number of required breath holds, but is typically performed with suboptimal flip angles (FA) due to SAR constraints and banding artifacts, both of which are significantly relaxed at 0.55T. In this work, we demonstrate blipped-CAIPI bSSFP cine imaging combined with spiral sampling for ventricular function at 0.55T with optimal FA for blood-myocardium contrast (100^o-120^o) at SMS factors of 2 and 3.

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