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Abstract #2550

New “restricted SAR mode” definition based on a thermal conservative model for relaxed unconditional safe in vivo experiments

Natalia Dudysheva1,2, Nicolas Boulant1, Alexandre Vignaud1, and Franck Mauconduit1
1CEA, NeuroSpin, Paris-Saclay University, CNRS, Gif-sur-Yvette, France, 2Multiwave Imaging, Marseille, France


In this work, we propose to extend the capacities of ultra-low SAR protocol used in coil design. A developed restricted SAR protocol holds the worst-case SAR below the threshold by constraining the total transmitted RF power. Since SAR reflects tissue heating, we exploit a conservative thermal model to derive relaxed SAR constraints depending on acquisition time. This enables to extend the options available for sequences played under this mode, including fat suppression, higher image resolution, or decreased TR.

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