Decoupling is a major technological challenge of High-Temperature Superconducting (HTS) surface coils. A promising strategy is to exploit nonlinearities in the HTS coil electric response to achieve decoupling. In this work, we present a new characterization method allowing the evaluation of these nonlinearities using MRI. We first present the theoretical model behind this approach; we then proceed to use it on 3D images of a water phantom in the vicinity of a copper coil and then a HTS coil to validate the model through the extraction of the quality factor Q, compared to the one measured by alternative methods.
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