Electromagnetic simulations for RF safety calculation require knowledge of tissue dielectric properties, but these are not well understood for neonates whose tissues have much higher water content than adults. This work retrospectively used MR-EPT on archived raw data obtained from a study on 800+ neonates, to measure tissue conductivity and permittivity at 128MHz. Presented are initial results from 50 subjects. The measured properties are rather noisy at the individual level, but across the whole cohort the median brain conductivity in neonates is approximately 1.8 times greater than in adults, in line with expectations from scaling arguments.
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