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Abstract #2688

Workflow proposal to test SAR virtual observation points with convex optimization: application to intersubject variability at 11.7T MRI

Vincent Gras1, Edouard Chazel1, Nicolas Boulant1, Alexis Amadon1, and Michel Luong1,2
1CEA, CNRS, BAOBAB, Neurospin, University of Paris Saclay, Gif sur Yvette, France, 2IRFU, Paris Saclay University, Gif-sur-Yvette, France

Synopsis

Keywords: Safety, Brain ConnectivityEfficient monitoring of the specific absorption rate (SAR) in parallel-transmission MRI is performed by evaluating the RF power deposition on specific SAR matrices called Virtual Observation Points (VOPs). But given the various sources of uncertainties that occur in practice (head placement, anatomy, precision of the body model to name a few), a challenging task remains to determine a suitable safety margin to be applied on the VOPs to offer a tradeoff between safety and scanning performance. In this work, as a first step towards this, we propose a workflow to tackle this problem for brain imaging at 11.7 Tesla.

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Keywords