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Abstract #2612

Achieving 2D sub-millimeter images using Phase-Encoded Frequency-modulated Rabi Encoded Echoes in a B0 gradientless inhomogeneous 0.5T magnet

Daniel Cosmo Pizetta1,2, Michael Mullen2, Parker Jenkins2,3,4, Edson Luiz Gea Vidoto1, Mateus José Martins1, Alberto Tannús1, Michael Garwood3,4, and Efraín Torres2
1Centro de Imagens e Espectroscopia por Ressonância Magnética - CIERMag - São Carlos Physics Institute, University of São Paulo – IFSC-USP, São Carlos, Brazil, 2Adialante LLC, Minneapolis, MN, United States, 3Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota, Minneapolis, MN, United States, 4Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN, United States

Synopsis

Keywords: Pulse Sequence Design, RF Pulse Design & Fields, RF Encoding & Imaging, B1 Encoding, Pulse sequence design

Motivation: MRI is the gold standard diagnostic technique, yet it is widely inaccessible – techniques to reduce its cost often drop its image quality.

Goal(s): Developing B1-encoded MRI pulse sequences that are immune to field inhomogeneity could enable the design of affordable, effective, and silent systems while retaining clinical-value.

Approach: We propose a 2D B1 encoding sequence in a two-channel Tx/Rx system with perpendicular and decoupled surface coils. The experiments are carried out in an inhomogeneous 0.5T permanent magnet.

Results: Experiments show phantom details with 0.2mm resolution using FFT and model-based reconstruction without any B0 gradients available.

Impact: 2D FREE’s results highlight the potential to enable high-resolution imaging despite large magnetic field inhomogeneities and no B0-gradient hardware. These advancements could enable new low-cost architectures that are effective and affordable, making MRI more accessible to the world.

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