Rapid 3D phase-based B1+ mapping using composite pulses for 23Na MRI at 7T
Autor(in); Institution
santoro, davide; Max Planck Research Group MR Physics, Max Planck Institute for Human Development, Berlin, GERMANY
Aigner, Christoph S; 8.1, Biomedizinische Magnetresonanz, PTB-Berlin; Max Planck Research Group MR Physics, Max Planck Institute for Human Development, Berlin, GERMANY
Madelin, Guillaume; Bernard and Irene Schwartz Center for Biomedical Imaging, Department of Radiology, New York University Grossman School of Medicine, New York, New York, USA
Quelle/Jahr
Proceedings of the International Society for Magnetic Resonance in Medicine:(2026)
Annual Meeting of the ISMRM, Capetown, 9-14, Mai, 2026, South Africa
Freie Schlagworte
7T ; B1 mapping ; 23NA-MRI
Zusammenfassung
Motivation: Quantitative 23Na-MRI requires precise B+1 correction, but at 7 T low SNR complicate accurate mapping.
Goals: To develop and evaluate a rapid, phase-based composite-pulse B+1 mapping method optimized for 23Na-MRI.
Approach: We implemented a semicircular magnetization trajectory using rectangular composite pulses within a 3D GRE framework, enabling simultaneous B1 and B0 mapping. Performance was assessed through simulations and phantom experiments, and compared to the Double Angle Method (DAM).
Results: The proposed method achieved higher phase accrual, improved SNR, and reduced acquisition time versus DAM. Despite lower averaging, B+1 maps showed accurate spatial distribution and robust performance, demonstrating feasibility for future in vivo 23Na imaging.
Zitierung
santoro, D., Aigner, C. S., & Madelin, G. (2026). Rapid 3D phase-based B1+ mapping using composite pulses for 23Na MRI at 7T. Annual Meeting of the ISMRM, Capetown, 9-14, Mai, 2026, South Africa.
