Accurate EM modelling of a not-fully accessible RF body coil at 3T for quantitative SAR investigations

Accurate electromagnetic modelling of RF transmit coils for MRI, e.g. for quantitative SAR assessments, can be difficult when not all coil details are directly accessible to the modelers. This is typically the case for commercial coils and most notably for the body coil of a clinical scanner. The present work illustrates the steps for the creation of an accurate model of a commercial 3 T body coil. Information provided by the manufacturer is merged with in-situ RF measurements on accessible ports and results from numerical simulations. The accuracy of this modeling is quantified comparing simulated and measured B1+ field maps in a extensive phantom study.

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