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Abstract #4251

Positional Sensitivity of Specific Absorption Rate in Head at 7T

Amer Ajanovic1, Joseph V Hajnal1,2, and Shaihan Malik1,2
1Biomedical Engineering Department, School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom, 2Centre for the Developing Brain, School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom

One of the main problems at UHF resonance frequencies is the significant spatial variation in radiofrequency electromagnetic fields. Mitigating this problem has been one of the goals of the parallel transmission MRI, but it causes greater local SAR variability, which has led to more rigorous safety restrictions. We have used MARIE with an MRGF implementation to study position sensitivity of SAR estimation at 7T by performing multiple simulations in which the coil is moved with respect to the head. We observe higher positional variability in rotational perturbations than in translational ones with solutions obtained in 7.5 min per body-coil configuration.

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