Abstract #4616

SAR and temperature in neonate models resulting from exposure to 7T head coil

Shaihan J Malik^1,2, Jeff W Hand^1,2, Ryan Satnarine¹, and Joseph V Hajnal^1,2

¹Biomedical Engineering Department, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom, ²Centre for the Developing Brain, School of Biomedical Engineering and Imaging Sciences, King's College London, London, United Kingdom

A safety study for neonatal MRI at 7T using an generic head transmit coil was performed using two baby voxel models, one of which was created as part of this study. Both adult and age-adjusted tissue properties were used in performing RF simulations. Simulations showed that SAR/W is increased for neonatal imaging, but the efficiency per B₁⁺² is comparable to adult imaging. The new neonate model additionally had a 'blanket' layer that could be used to simulate thermal insulation as is often used in practice. Thermal simulations suggest that scanning within IEC SAR limits does not lead to excessive heating.

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