Abstract #4258

Hybrid-State Free Precession for Measuring Magnetic Resonance Relaxation Times

Jakob Assländer^1,2, Daniel K Sodickson^1,2,3, Riccardo Lattanzi^1,2,3, and Martijn Cloos^1,2

¹Bernard and Irene Schwartz Center for Biomedical Imaging, Dept. of Radiology, New York University School of Medicine, New York, NY, United States, ²Center for Advanced Imaging Innovation and Research (CAI2R), Dept. of Radiology, New York University School of Medicine, New York, NY, United States, ³Sackler Institute of Graduate Biomedical Sciences, New York University School of Medicine, New York, NY, United States

This work analyzes the spin physics in steady-state free precession sequences modified to smoothly vary sequence parameters, as suggested in MR Fingerprinting. We arrive at the conclusion that a transient state develops only in one direction, while the magnetization in the other two dimensions transitions adiabatically between steady states. We provide solutions of the Bloch Equations for this hybrid state and demonstrate the superior T₁- and T₂-encoding performance of the hybrid state compared to the steady state.

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