Mathematical Tools to Define SAR Margins for Phased Array Coil In-Vivo Applications Given E-field Uncertainties
Guillaume Ferrand 1 , Michel Luong 1 , Alexis Amadon 2 , and Nicolas Boulant 2
DSM/IRFU/SACM, CEA-Saclay, Gif-sur-Yvette,
CEA-Saclay, Gif-sur-Yvette, France
In high field MRI, a phased array coil comprising a
large number of transmit elements appears more
attractive with regard to local SAR reduction and to RF
inhomogeneity mitigation. However, the linear
combination of electric fields errors makes the total
SAR error much more complex to estimate. Here, we
propose mathematical tools and hypotheses to estimate
the standard deviation of the SAR produced by multiple
transmit elements, knowing the standard deviation of the
error on the electrical field produced by each element.
Thanks to these tools, the best margins can be applied
to the final SAR, to ensure the safety of the patient in
in-vivo experiments, without overconservative measures.
This abstract and the presentation materials are available to members only;
a login is required.