Optimized ultrahigh field parallel transmission workflow using rapid 
presaturated TurboFLASH transmit field mapping with a three-dimensional centric 
single-shot readout

Bosch, D; Bause, J; Geldschläger, O; Scheffler, K

doi:10.1002/mrm.29459

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Optimized ultrahigh field parallel transmission workflow using rapid presaturated TurboFLASH transmit field mapping with a three-dimensional centric single-shot readout

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Bosch, D
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Bause, J
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Geldschläger, O
Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Scheffler, K
Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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https://onlinelibrary.wiley.com/doi/epdf/10.1002/mrm.29459
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Citation

Bosch, D., Bause, J., Geldschläger, O., & Scheffler, K. (2023). Optimized ultrahigh field parallel transmission workflow using rapid presaturated TurboFLASH transmit field mapping with a three-dimensional centric single-shot readout. Magnetic Resonance in Medicine, 89(1), 322-330. doi:10.1002/mrm.29459.

Cite as: https://hdl.handle.net/21.11116/0000-000B-1DE7-1

Abstract

Purpose: To evaluate the usage of three-dimensional (3D) presaturated TurboFLASH (satTFL) for B+1 and B0 mapping on single channel and parallel transmission (pTx) systems.
Methods: B+1 maps recorded with 3D satTFL were compared to maps from three other 3D B+1 mapping sequences in an agar phantom. Furthermore, individual-channel B+1 maps of 18 human subjects were recorded with 3D satTFL using B+1
interferometry. A neural network was trained for masking of the maps.
Results: Out of the sequences compared satTFL was the only one with a mapping range exceeding well over 90°. In regions with lower flip angles there was high correspondence between satTFL and AFI. DREAM and double angle method also showed high qualitative similarity, however the magnitude differed from the other two measurements. The individual-channel B+1
maps were successfully used for pTx pulse calculation in a separate study.
Conclusion: 3D satTFL can record high-quality B+1 maps with a high dynamic range in a short time. Correspondence with AFI maps is high, while measurement duration is reduced drastically.