In view of building a flexible 7T 2D coil array for cardiac MRI at 7 T, transmission line resonators (TLRs) with and without decoupling ring are investigated. Using 3D EM simulation and MR measurements for single elements, it could be shown that the presence of the decoupling ring does not perturb significantly the $$$B_1^+/\sqrt{P_{input}}$$$ distribution of the TLR. 3D gradient echo images for both TLRs with and without decoupling rings have been acquired. No significant degradation in the image quality due to the presence of the decoupling ring was observed.
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