Abstract #0694

Comparison of free-breathing self-gated continuous IR spiral T1 mapping: dual flip angle versus Bloch-Siegert B1-corrected techniques

Ruixi Zhou¹, Daniel S. Weller², Yang Yang³, Junyu Wang¹, John P. Mugler⁴, and Michael Salerno⁵

¹Biomedical Engineering, University of Virginia, Charlottesville, VA, United States, ²Electrical and Computer Engineering, University of Virginia, Charlottesville, VA, United States, ³Biomedical Engineering and Imaging Institute and Department of Radiology, Icahn School of Medicine at Mount Sinai, New York, NY, United States, ⁴Radiology, Biomedical Engineering, University of Virginia, Charlottesville, VA, United States, ⁵Cardiology, Radiology, Biomedical Engineering, University of Virginia, Charlottesville, VA, United States

We propose a technique to acquire accurate B1 and T1 maps in a free-breathing cardiac self-gated continuous Look-Locker, inversion-recovery acquisition. Data are acquired using a single spiral interleaf, rotated by the golden-angle in time. During the first 2 seconds, off-resonance Fermi pulses are applied to generate a Bloch-Siegert shift B1 map, and the later data are acquired with an inversion RF pulse applied every four seconds to create T1* map. The final T1 map is generated with the B1 map and T1* map by using a look-up table to account for slice profile effects yielding more accurate T1 values.

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