Abstract #0873

Evaluation of transmit sensitivity (B1+) encoding in MR fingerprinting at 7T

Ding Xia^1,2, Zidan Yu^1,2,3, Riccardo Lattanzi^1,2,3, and Martijn A Cloos^1,2

¹Center for Advanced Imaging Innovation and Research, Department of Radiology, New York University School of Medicine, New York, NY, United States, ²Center for Biomedical Imaging, Department 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

We evaluated the ability of three reported MR fingerprinting methods to mitigate the effect of B₁⁺ inhomogeneity at 7T. Results from each method were compared with gold standard results. All methods provided relatively accurate T1 quantification. We show that T2 cannot be accurately quantified at 7T without accounting for B₁⁺ in the MR fingerprinting dictionary. The Inversion-Recovery-FISP-FLASH (IRFF) method provided the most accurate T2 values. We conclude that the use of both FISP and FLASH segments best encodes B₁⁺ into the fingerprint.

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