Abstract #3699

Universal Parallel Transmit Pulse Design for 3-D Local-Excitation based on different sized databases of B0/B1+-maps – A 7T Study

Ole Geldschläger¹, Tingting Shao¹, Jürgen Herrler², Armin Nagel^3,4, and Anke Henning^1,5

¹High-field Magnetic Resonance, Max-Planck-Institut for biolog. Cybernetics, Tübingen, Germany, ²Institute of Neuroradiology, University Hospital Erlangen, Erlangen, Germany, ³Institute of Radiology, University Hospital Erlangen, Erlangen, Germany, ⁴Institute of Medical Physics, Friedrich Alexander University Erlangen Nürnberg, Erlangen, Germany, ⁵Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, United States

This study investigates universal parallel-transmission (pTx) radio-frequency-pulses for 3-dimensional local-excitation designed on different sized databases of B₀/B₁₊-maps from human heads at 7T. Thus, it prospectively abandons the need for time-consuming subject specific B₀/B₁₊-mapping and pTx-pulse calculation during the scan session. For the proposed calculation routine, the design-database does not need to include more than five heads, to achieve a pTx-pulse that excites the same 3-dimensional local-excitation target-pattern on the tested 40 different heads. The resulting universal pulses created magnetization-profiles with (in most cases) an only marginally worse Normalized-Root-Mean-Square-Error compared to the magnetization-profiles produced by pulses tailored to individual heads.

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