Abstract #2973

Bloch-Siegert flip angle calibration for phosphorus at the human brain at 9.4 T using ISIS localization

Loreen Ruhm¹, Johanna Dorst¹, Nikolai Avdievich¹, and Anke Henning^1,2

¹Max Planck Institute for Biological Cybernetics, Tuebingen, Germany, ²Advanced Imaging Research Center, UT Southwestern Medical Center, Dallas, TX, United States

Correct calibration of the transmit field B₁⁺ is crucial to achieve optimal SNR. However, fast and robust B₁⁺ calibration is difficult for X-nuclei due to the low signal sensitivity. In this work, we proposed a fast B₁⁺ calibration method based on the Bloch-Siegert shift and single voxel ISIS localization. With the proposed sequence, the B₁⁺ calibration can be done in less than 5 min for the human brain at B₀ = 9.4 T.

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