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Abstract #0457

Inter-subject differences in SAR sensitivity to motion with parallel-transmit at 7T.

Alix Plumley1, Nathan Goodwin1, and Emre Kopanoglu1
1Cardiff University, Cardiff, United Kingdom


Specific absorption rate (SAR) is sensitive to head motion, especially in parallel-transmit (pTx) due to channel interference. It is known that SAR distribution varies according to subject anatomy. Here, we investigate whether SAR sensitivity to motion also depends on the subject. We designed quadrature-mode and pTx pulses at a centred position and evaluated them at 29 displaced positions. We compared the motion-induced SAR change across 4 body-models. We observed some variation across models, but local-SAR at least doubled in all models’ worst-cases. Our findings suggest that the safety concerns surrounding motion effects on SAR are relevant for various populations.

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