451-01-008 / 451-01-008 ISMRM Abstract

Hybrid Precision Absolute B1+ Mapping at 7T: Experimental Comparison of Sequential and Interleaved GRE Acquisition Strategies

Primary: Physics & Engineering - High-Field MRI

Secondary: Physics & Engineering - Parallel Transmit & Multiband

451-01-008 · Parallel Transmission at High Fields · Tuesday, 12 May, 8:20 AM–9:56 AM · Power Pitch Theatre 1

Keywords: RF Pulse Design & Fields Ultra-high field PTx B1 Mapping

Accepted

Max Lutz ¹, Christoph S Aigner^1,2, Felix Krueger¹, Sebastian Schmitter^1,3,4

¹Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany

²Max Planck Institute for Human Development, Berlin, Germany

³Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, United States of America

⁴Division of Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany

Presenting Author: Max Lutz

Synopsis

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References

1. Ladd ME, Bachert P, Meyerspeer M, et al. Pros and cons of ultra-high-field MRI/MRS for human application. Prog Nucl Magn Reson Spectrosc. 2018;109:1-50. doi:10.1016/j.pnmrs.2018.06.001 [doi]

2. Padormo F, Beqiri A, Hajnal JV, Malik SJ. Parallel transmission for ultrahigh-field imaging. NMR Biomed. 2016;29(9):1145-1161. doi:10.1002/nbm.3313 [doi]

3. Van de Moortele PF, Snyder C, DelaBarre L, Adriany G, Vaughan T, Ugurbil K. Calibration Tools for RF Shim at Very High Field with Multiple Element RF Coils: From Ultra Fast Local Relative Phase to Absolute Magnitude B1+ Mapping. In: Proceedings of the 15th Annual Meeting of ISMRM. Berlin, Germany; 2007:1676.

4. Brunheim S, Gratz M, Johst S, et al. Fast and accurate multi-channel mapping based on the TIAMO technique for 7T UHF body MRI. Magn Reson Med. 2018;79(5):2652-2664. doi:10.1002/mrm.26925 [doi]

5. Padormo F, Hess AT, Aljabar P, et al. Large dynamic range relative B1+ mapping. Magn Reson Med. 2016;76(2):490-499. doi:10.1002/mrm.25884 [doi]

6. Egger N, Ruck L, Nagelstraßer S, et al. Evaluation of an interleaved acquisition scheme for improved robustness of channel-wise relative B1+ mapping at 7 T. Magn Reson Med. n/a(n/a). doi:10.1002/mrm.70101 [doi]

7. Lutz M, Aigner CS, Flassbeck S, et al. B1-MRF: Large dynamic range MRF-based absolute B1+ mapping in the human body at 7T. Magn Reson Med. 2024;92(6):2473-2490. doi:10.1002/mrm.30242 [doi]

8. Lutz M, Flassbeck S, Aigner CS, Krueger F, Schaeffter T, Schmitter S. Accurate MRF-Based 3D Multi-Channel B1+ Mapping in the Human Body at 7 T. NMR Biomed. 2025;38(8):e70080. doi:10.1002/nbm.70080 [doi]

9. Ertürk MA, Raaijmakers AJE, Adriany G, Uğurbil K, Metzger GJ. A 16-channel combined loop-dipole transceiver array for 7 Tesla body MRI. Magn Reson Med. 2017;77(2):884-894. doi:10.1002/mrm.26153 [doi]

10. He X, Schmidt S, Zbýň Š, Haluptzok T, Moeller S, Metzger GJ. Improved TSE imaging at ultrahigh field using nonlocalized efficiency RF shimming and acquisition modes optimized for refocused echoes (AMORE). Magn Reson Med. 2022;88(4):1702-1719. doi:10.1002/mrm.29318 [doi]

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http://echo.ismrm.org/p/ISMRM2026/451-01-008