Deep learning accelerated Sandwich for 3D multi-channel B1+ mapping at 7T in less than 10 seconds
Motivation: Online multi-channel B1+ mapping is essential in ultra-high field MRI for individual optimization of parallel transmit pulses. Goal(s): To rapidly and accurately estimate multi-channel B1+ maps at 7T. Approach: A deep learning reconstruction was implemented for accelerating the Sandwich sequence. The approach was validated by comparing the estimated 3D B1+ maps of five subjects with the fully sampled acquisitions and conventional compressed sensing reconstructions. Results: The proposed deep learning method generates accurate 3D multi-channel B1+ maps in under 10 seconds, with an RMSE of 3.6$$$\,$$$±$$$\,$$$1.4° for a target flip angle of 90°. Impact: This study demonstrates a deep learning-based method for rapid B1+ mapping in ultra-high field MRI, significantly reducing acquisition time to under 10 seconds while maintaining accuracy. The approach enhances the efficiency of parallel transmission, facilitating clinical applications at 7T.
Authors
- Tom Hilbert (ORCID: https://orcid.org/0000-0001-8207-4908)
- Aaron T. Hess (ORCID: https://orcid.org/0000-0002-9289-5619)
- James Kent (ORCID: https://orcid.org/0000-0003-3331-2409)
- Patrick Alexander Liebig (ORCID: https://orcid.org/0000-0001-7342-3715)
- Dominik M. Nickel (ORCID: https://orcid.org/0000-0002-0360-7233)
- Robin Martin Heidemann (ORCID: https://orcid.org/0000-0001-7556-7405)
- Bénédicte Maréchal (ORCID: https://orcid.org/0000-0001-7866-2854)
- Gian Franco Piredda (ORCID: https://orcid.org/0000-0002-8449-6634)
- Jocelyn Philippe (ORCID: https://orcid.org/0009-0009-5952-6107)
- Tommaso Di Noto (ORCID: https://orcid.org/0000-0002-5161-055X)
- Jürgen Herrler (ORCID: https://orcid.org/0000-0002-4620-8216)
- Thomas Yu (ORCID: https://orcid.org/0000-0002-5841-0198)
- Antoine Klauser (ORCID: https://orcid.org/0000-0003-3019-9914)
- Tobias Kober (ORCID: https://orcid.org/0000-0001-7598-9456)
- Emilie Sleight (ORCID: https://orcid.org/0000-0003-0034-4578)
- Lina Bacha
- Natalia Pato Montemayor (ORCID: https://orcid.org/0009-0006-7212-1970)
- Jean-Philippe Tiran
Publication Details
- Journal
- Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
- Published
- 2025-09-16
- DOI
- https://doi.org/10.58530/2025/2628
- Primary Topic
- Advanced MRI Techniques and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00