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Abstract #0478

Local SAR comparison of leg positioning in 16-channel proton/sodium dipole/loop array for 7T MRI

Menglu Wu1, Jessica M Winfield2,3, Pete Lally4,5, and Ozlem Ipek1
1King's College London, London, United Kingdom, 2Department of Physics, The Royal Marsden NHS Foundation Trust, Sutton, United Kingdom, 3Division of Radiotherapy and Imaging, The Institute of Cancer Research, London, United Kingdom, 4Department of Bioengineering, Imperial College London, London, United Kingdom, 5London Collaborative Ultra high field System (LoCUS), London, United Kingdom

Synopsis

Keywords: Safety, Safety

Motivation: Sodium(23Na)/proton(1H) MRI of the extremities have great potential in diagnosis and treatment of musculoskeletal conditions and oncology applications (e.g.soft-tissue sarcomas).

Goal(s): Assessing the performance of a novel 16-channel 1H/23Na MRI coil across varied leg positions and establish safe RF power limits for clinical applications.

Approach: Electromagnetic simulations to analyse coil performance in four leg positions. SAR10g levels were compared across configurations while maintaining B1+ field efficacy.

Results: The coil showed consistent B1+ performance across all tested positions. The highest SAR levels occurred with calf-to-coil contact, aligning with predictions. Safe RF power limits were established, supporting the coil's clinical potential for extremity imaging

Impact: This study validates an innovative 16-channel 1H/23Na coil, setting benchmarks for safe RF power limits, and enhancing disease characterisation, enabling clinical research in musculoskeletal pathologies and soft-tissue sarcoma in the extremities.

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Keywords